Fix: Large image result in attachment not found

[mohammadjafarinejad]

Explanation of Change

Fixed Issues

$ #76193
PROPOSAL: #76193 (comment)

Tests

1. Open a conversation
2. Click on "+" in the compose box
3. Click "Add attachment" and upload a large, high-quality image (like the one used in issue [$250] Attachments - Large image result in attachment not found after being zoomed at first time #76193 (comment))
4. Click on the preview and wait until the image gets uploaded
5. Verify that after upload, the image reloads with the preview image (thumbnail)

• Verify that no errors appear in the JS console

Offline tests

None.

QA Steps

Same as test.

• Verify that no errors appear in the JS console

PR Author Checklist

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Screenshots/Videos

Android: Native

android.mp4

Android: mWeb Chrome

android-web.mp4

iOS: Native

ios.mp4

iOS: mWeb Safari

ios-web.mp4

MacOS: Chrome / Safari

web.mp4

[melvin-bot]

@ahmedGaber93 Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[ahmedGaber93]

Reviewer Checklist

• I have verified the author checklist is complete (all boxes are checked off).
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  • I verified any copy / text shown in the product is localized by adding it to src/languages/* files and using the translation method
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  • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
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• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
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Screenshots/Videos

Android: HybridApp

20260209204729911.mp4

Android: mWeb Chrome

20260209195604424.mp4

iOS: HybridApp

20260209202912318.mp4

iOS: mWeb Safari

20260209195338933.mp4

MacOS: Chrome / Safari

20260209173117811.mp4

[ahmedGaber93]

@mohammadjafarinejad Curious why did you change your fix from:

key={`${attachmentID}-${isHighResolution && isUploaded ? 'preview' : 'full'}`}

to

key={imageSource}

The difference between the two is whether the transition loading screen appears on all images or only on large images.

20260209205505935.mp4

[ahmedGaber93]

@mohammadjafarinejad could you please stick to your original proposal, or clarify why it was changed?

[mohammadjafarinejad]

@ahmedGaber93 Ready for re-review.

@mohammadjafarinejad Curious why did you change your fix from:

There's a similar transition issue with scan receipts where the image disappears during the blob → server upload transition (in that case, attachmentID is undefined). I initially tried fixing it by using key={imageSource}, but that caused regressions for normal images, as you mentioned.

So I think that bug is out of scope for our PR. WDYT? I went with the original proposal.

[ahmedGaber93]

There's a similar transition issue with scan receipts where the image disappears during the blob → server upload transition

@mohammadjafarinejad Are able to reproduce it on staging? Can you share a video?

[mohammadjafarinejad]

@ahmedGaber93 Yes, I can reproduce it on staging too.

• High-quality image

REC-20260217191322.mp4

• Normal image

REC-20260217191659.mp4

[ahmedGaber93]

I agree this is a different issue, and it already exists on staging.

• There’s no error like in our issue (“attachment not found”); it’s just some lag.
• The lag here has a completely different root cause, since receipts and attachments handle high-resolution images differently. Receipts don’t use a preview image; they always display the original file, even if it’s high resolution, unlike attachments.

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