Thumbnails from SharePoint library wont show anymore

(0) Share

Report

Posted on by DT-26082110-0

I have a gallery from a SharePoint library images were showing correctly and now all of a sudden they wont show anymore.

I am using ThisItem.Thumbnail.Large,

I have tried multiple options like link to item, full path , the images will show when Editing the app but not in the tablets.

Categories:

Power Apps Pro Dev & ISV

Building Power Apps

I have the same question (0)

All responses (3)

Answers (0)

Sort by

RFSDP 18 on at

Like
a
(0)

Report
Copy link

Link copied!

check out this other post which details a number of us all having the same issue ..

https://community.powerplatform.com/forums/thread/details/?threadid=a10cb1bc-1c9b-f111-b8dc-3833c5e85ffd

Best regards,

Derek

Was this reply helpful? Yes No
Suggested answer

11manish 4,267 Super User 2026 Season 2 on at

Like
a
(0)

Report
Copy link

Link copied!

The formula is probably not the root cause. The strongest evidence is that it works in Studio but fails on the tablet. Therefore, the recommended troubleshooting path is:

Published app → verify thumbnail value → verify SharePoint access → refresh connection → test Medium thumbnail → test another device/user → investigate connector/mobile regression if still failing.

Was this reply helpful? Yes No
Suggested answer

Syed Aqib Raza 68 on at

Like
a
(0)

Report
Copy link

Link copied!
This usually happens because ThisItem.Thumbnail.Large behaves differently between Power Apps Studio preview and the published app / tablet player. The thumbnail object returned by a SharePoint document library is not always consistently accessible across clients.

Instead of relying directly on:

ThisItem.Thumbnail.Large

try checking whether the thumbnail is actually available and provide a fallback:

If( !IsBlank(ThisItem.Thumbnail.Large), ThisItem.Thumbnail.Large, ThisItem.'Link to item' )

However, Link to item is a link to the SharePoint document and is not necessarily a direct image URL, so it may not work as an Image control source.

A few things I would check:

Refresh the SharePoint data source in Power Apps Studio.

Remove and re-add the SharePoint document library connection if the issue started suddenly.

Check whether the affected users/tablets have access to the actual SharePoint library and files.

Republish the app after refreshing the data source.

Completely close/restart the Power Apps mobile app and clear its cached version if applicable.

Test whether the issue happens with newly uploaded images as well as existing ones.

Check whether this is specific to the Power Apps mobile/tablet player, since Studio preview can sometimes use a different authentication/session context.

You can also inspect the actual value being returned by adding a Label temporarily:

ThisItem.Thumbnail.Large

If it works in Studio but not on tablets, I would particularly suspect a client caching/authentication issue or a change in how the SharePoint thumbnail endpoint is being accessed by the mobile player.

If this started suddenly without any app changes, testing with a fresh SharePoint connection and a newly published version of the app would be my first step.

Was this reply helpful? Yes No