thunderbird / thunderbird/thunderbird-android
Thunderbird shows a random attachment
Nobody has claimed this yet.
- Dominant language
- Kotlin
- Stars
- 14k
- Forks
- 2.8k
- Avg merge
- 3d 3h
- Merged PRs (30d)
- 57
Description
Checklist
- I have used the search function to see if someone else has already submitted the same bug report.
- I will describe the problem with as much detail as possible.
App
Thunderbird for Android
App version
21.0
Where did you get the app from?
F-Droid
Android version
16
Device model
Poco F7
Steps to reproduce
Today I received an invoice with an attached PDF.
When I tried to view the PDF, Thunderbird showed a PDF from another email from November 2025 instead.
After clicking on "download whole message", I noticed that the file size had changed, but Thunderbird still showed the wrong attachment.
The file name for the PDF attachment was unique, so there's no mistaking one for the other.
Expected behavior
Thunderbird should show the actual PDF that is attached to the email.
Actual behavior
Thundbird shows some random attachment instead.
Logs
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
No source file, test, or entry point is named. Start by reproducing the attachment display problem on Thunderbird for Android 21.0 with an invoice PDF and another message's PDF, then trace the attachment loading and caching path. Done means the selected message consistently displays its own attached PDF, including after downloading the whole message.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- android, kotlin
- Domain
- mobile
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 48/100