Ok, I figured the multi-user workaround this morning and am sharing my results. Maybe it's worth pinning so it's more easily found. I think a lot of us are wandering around in the dark bumping into stuff because we're not full-time developers and often need very clear stepwise instructions to follow. If I've messed anything up in these instructions let me know and I'll edit this comment. So, once you have things working exactly as Reza has so elegantly explained, do the following: 1. Grab a PNG from somewhere. 2. Rename it DONOTREMOVE.png 3. Put it in the lowest/highest level of your document library. You know, the place that exists as soon as you create a new library before you do anything else. NOTE: The file needs to be here to ensure the path only contains the root of the library. 4. Refresh your datasource/library in the app and click on that image in the gallery. Leave the label control in place with Gallery.Selected.Pic as the text so you can see that the appres link is properly generated. 5. Now we're going to change the document property so that it uses a dynamically generated link for that DONOTREMOVE.png file with substitutions for the actual filename and path. 6. Refresh your datasource/library in the app again. 7. Use the Substitute statement from @nikolaus-lukasthomas6288 in the Document property of the PDFViewer. 8. substitute(LookUp(YOURLIBRARYNAME, Name="DONOTREMOVE").Pic, "PowerAppsDocs%252fDONOTREMOVE.png", "")&EncodeUrl(Gallery2.Selected.'Folder path' & Gallery2.Selected.'File name with extension') Bob's your uncle. Huge thank you to @RezaDorrani and @nikolaus-lukasthomas6288 for providing me all the answers I needed.

First; thank you so much Reza. This is a very clever solution. For all those having issues, I was having issues too. It has been discussed in a few comments. The problem is, as someone mentioned, that the appres string that is generated includes a unique user code embedded within the string. So while the hard coded appres string will work for the developer all day, it will not work for anyone else, as they will have a different string generated/required for them. SO....the solutions is to grab the appres code dynamically, for each user. This is what I used. On-select of the gallery, grab a variable Then in the Documents property for the PDFviewer split and append string as follows: (replacing the hardcoded appres string) First(Split(appresValue,"path=%252f")).Value&"path=%252f"&EncodeUrl(gallery.Selected.'Folder path' & gallery.Selected.'File name with extension') This solved it for me. Please upvote so people can see the solution. Thanks

Absolutely brilliant!! This was a great tutorial and right on time for one of my projects. Please, do continue with the breadcrumbs and the folders! Thank you!!

Must say - it's one of THE BEST !! Now I can't wait to see part 2 with folders and filters.

This is probably the most insightful and useful Power Apps video I have watched this year. Genius. Thanks Reza.

This is brilliant, every time I watch your video I learn something new, Thanks very much for your work!!

Wow!!!!!!! This is absolutely amazing and mind blowing, well Done Reza!!. Your videos are highly educative, informative and prompt. I am looking forward to the version 2 of this video and many more. Thank you!!!!!!!

I never normally comment on KZfaq vids, but this is brilliant. Thank you Reza!

As always, Reza, A lifesaver!! Thanks so much! Just love your teaching style!

Amazing work Reza.. No words to express. I was looking for a similar functionality instead of using Flow and here it as a ready to use.. Clear and precise.. I am really looking forward towards part 2 of this video. Your videos are extremely useful for amateur developers like me.. Great source of knowledge

Best teacher Best programmer Best apps creator Best applicator Best of the best Salute to you

Mate, you have killed it. Spot on. I was also looking a way to display PDFs without flow. You gave much more. And the next video you talked about, I'm waiting for it. Thanks.

Very cool! I didn't quite understand the part about having to convert pdf to pdf, but I'll watch it again with more attention. This apprentice of PowerApps here in Brazil is very grateful for his teachings. 👍 It cost!

This video came along at the perfect time for the current project I am working on, thank you so much for producing this! I did want to share real quick an addition I added to this to allow you to launch a PDF from the viewer, since that control seems to not show up when looking at a PDF doc after implementing your solution. I just added an icon in the same size and position of the pdf viewer pop out icon. I then modified it's visible property to true, only if the document type is PDF. For the on select property I just used Launch('Gallery'.Selected.'Link to item')

Genius ! Would love to see the next iteration with folders and breadcrumbs :)

Thanks Reza Dorrani. Brilliant research and simple to follow instructions.

Amazing hack Reza. I have been looking at how to do this without needing flow, This is exactly what I need to finish a project far quicker. Thank you

you are genius, omg I need cup of tea to hundel all idea in my head after seeing this video. thanks for sharing

You’ve cracked what I’ve been trying to work around for the past week. Thank you, sir. Folders and breadcrumbs please!

You are the best teacher about Power apps, congratulations for your job!!!

Thanks Reza.. very helpful to see how you displayed the documents without using a Flow.. is interesting that a blog/hack from back in 2017 is still useful today. Folders and breadcrumbs would be an excellent sequel to this video.. keep up the great work..thanks again

What a great solution! You really are great, Reza! Thank you very for your discovery!

Thank you Reza, you helped me a lot with my project.

Amazing video Reza. So much value! Looking forward to the navigating folder structure add-on.

Wow, Reza, my head explodes from pure joy. I had been using Paul Culmsee's flow, but it is a quite complicated ... the solution you show here is mc^2. Thank you!!!!!

Just found this video and relatively new to Power Apps, but this video was absolutely "FANTASTIC" . I also sincerely appreciate your efforts to make it so easy to follow what you have done. You are a fantastic trainer and very articulate! Thank you!

Congrats on this video! I was looking for something without flow and this video helped me a lot. Just an obs in my case: I needed to replace "result" with "value"

Brilliant video Reza. Too good. Always have wondered how to optimize the pdf viewer control. This is just the next level.

Thank you, Reza. Beautiful approach. Felt so very happy. Thank you.

Great work around, some id been using but helpful on when it was a PDF best way to do it without a Flow. Hopefully Microsoft will implement though at some point a proper “document viewer” with some additional features. Would love to see you expand this further especially with the folder and breadcrumbs

Awsome job! Worth to mention is ,that it is mandatory at 18:54 to change the format to picture otherwise it will just parse the plain url to Powerapps. However thank you!

Wow, Thanks a lot! it was first PowerApp and it worked because of your instructions!

Reza, awesome does not even describe your genius. If there was a Power Apps category on America's Got Talent, I would submit your name. I had built a document library using another method I found but after seeing this video, I scrapped it and built it completely over using this solution. Can't thank you enough for the contributions you make to the community.

Please build on the folders and breadcrumbs. This is very informative.. Thanks Reza.

What can I say??? It is just awesome all the way

One word for you Reza "Life Saver", you make Power Apps worthwhile with your videos, please continue with videos its a great source of knowledge millions of developers

Exactly what I have been looking for. It all worked for me Clean and simple solutions Thank you very much.

Hi Rezza, I am great admirer of your work and have learnt a lot. Thanks for such great stuff. I tried this solution, works flawlessly for me but other users are not able to see the documents in PDF viewer even though I have given them "Full Control" over the Sharepoint folder. Anything that you could advise.

Hi Reza, Thank you for all the great ideas and helpful tutorials. I did run into an issue when I created this app and I hope you might have an idea why. The app I created works perfectly for me. However, when I shared with coworker the PDF's don't view. If I make them a co owner and they follow the steps for retrieving the image code and paste in pdf viewer document code, then it works for them but not me, lol. Everything else works but pdf. I was hoping embed this on a SharePoint site for many to use. Thank you!!!

Fantastic Reza. Just what I needed to do for my new project. You have done all the heavy-lifting, saving me a lot of time. Thanks a million!

Great solution, just what I needed I spent a lot of time on a solution for viewing PDF. Thanks

Another great tutorial Reza, oh, I have the absolute please to know Paul (he's amazing). I've learnt so much from people like you, Paul and Shane Young.

What a great video Reza!!!!! Keep them coming!!!

Brilliant!! Please continue adding features.

Thank you for sharing your Knowledge Reza! much appreciation 🙏🙏🙏

Reza!!! This is a total hack and an answer to soooo many things...Thanks bro. Please please please do not stop. Kindly continue these great educational videos

Definitely deserve a like. Simply awesome.!!!

Thank you for this. This video showed me how to do everything I needed to do.

Wow 👏🏻 im using that flow approach in one of my app now will be change with this one thanku for this superb trick👍🏻

Super Super Brilliant.. Thank You Reza for sharing with us.

Awesome work. You always seem to bring out a vid that suits a couple of use cases I have at any time.... Would definitely like to see folder navigation

This was so extremely helpful! Thank you so much for posting this video. I have subscribed so that if/when you add a video with the extra tid bits you mentioned I can soak up the knowledge!

A+, great findings. Waiting for pt2

Really really nice Reza!!! Loved your demo!

many thanks M.Reza Dorrani , you are the best :)

Really nice job, and I reallly the way you explain your work ! Bravo !

Thank you Reza. Your video gives me more ideas how to improve my apps.

This is so flippin cool! Thank you so much! This is going to take my new app to the next level.

Hi Reza, once again a great solution. Than you for this,I recognized just now! This brings so much additional options in building user friendly apps.

You always impress me with your works. This video is a must-keep. I might use this in the future. Thanks for sharing your knowledge.

Just amazing as always.Thanks, Reza

Brilliant as always... thanks a lot! You are the best!

i was looking for this 4hours ! tankiuuuuuuuuuuuuuuuuuuuuuuuuuu !!!

Dear Reza, I am really impressed, you are the MASTER !!!! Thanks a lot for sharing, this tip will solve a strong issue I had since years not been able to see the drawings in *.pdf or *.tif in sharepoint and powerapp. This Thumbnail features is amazing and allowing to see whatever doc as an image.

Thank you Reza, its a great video, great work!!!!!

Thank you so much! Exciting!

Reza, the detective!! Genius.

Amazing! Thank you so much for this Raza.

Thanks for sharing your knowledge!

Great video again.Clever workaround 😇Thanks Reza. I was about to bring out launch browser option not showing for the pdf file. But that has been already clarified in the previous comments 👍 Our entire project team following your videos and implementing it😀

You are the best teacher! Thats the comment :-)

Absolutely amazing! I love this.

Superb!! You played with it...Yes, need that filtering files/folders option.

Amazingly well explained

Superb one .....! Once again proven Genius!

Thank you for this video. Was looking for something like this one. 😊

Excellent material, Reza!!

Excellent, gave me a new way of thinking

Woaw Amazing job Reza ! Just what i needed... :D

Magic! Brilliant video Reza

Outstanding work!

This is awesome, thanks again for your videos 👍👍👍

Yes, folders, filters and breadcrumbs would be awesome.

Reza Thanks for your video i was stuck on that part on my work it was very useful, it's a relief to get this part done

So good Reza, thanks again for your awesome videos.

Another awesome video Reza!!

Thanks for the swift reply. Will try my luck there.

Fantastic!!! Thank you so much!

Wao! you are grate Mr. Reza it rocks, I was struck for getting this done without flow, now zuuuuuuup... Thanks a lot for this video.

Well done Reza, very neat solution!

This is simply awesome. I searched to have to option for last few days and ended up with a not clear viewable excel thumbnail

Truly, you are the best. Please do a video to further expand this as you mentioned at the end of this video.

Gr8 one...Looking forward for more...Thanks for sharing

Simply awesome informative video eagerly waiting for the next part .Like your all other video tutorials series you are making us more skillful. Thank you

Very helpful . Thanks for sharing.

Brilliant, thanks Reza!

Awesome video. Thank you for the hard work to create valuable content. Please make this into series of videos. Looking forward to it.

Amazing Reza! I've been following you for a while and every time I think I know enough you surprise me with these brilliant ideas and examples! I'll most definitely use this one! Excellent video. Now I share my challenge with you... I'm trying to do the same for SharePoint list items when you need to preview the attachments! It's taking a lot of reading, but eventually I hope I'll get there. Thanks for sharing!

Awesome just as I need, it come in time :) for the folder too in the other video

Simply fantastic!