Media picker can't access screenshots after they have been edited by stock Gallery app

[Saroumane]

Phone : Pixel 6a GrapheneOS build 2024091900

Steps to reproduce :

1. Make a screenshot (Vol Down + Lock button)
2. Open stock Gallery app, edit the screenshot, save
3. Open stock Vanadium app, go to x.com, start a post, clic on the button to add a picture
4. the Media picker is started, on default tab "Photos", "Recent". The edited screenshot is missing.
5. Clic on "Albums" tab, then on "Screenshots" album. The edited screenshot is still missing.

Verification 1 : Go to Settings / Apps, then "show system apps", choose "Media picker" All values are on default. Permissions say "Allowed : Notifications, Sensors". Not allowed : No permissions denied.

Verification 2 : Redo Steps 1 - 5, minus step 2. The (unedited) screenshot is both present in Photos / Recent and Albums / Screenshot (from Media picker)

[Saroumane]

"thestinger transferred this issue from GrapheneOS/os-issue-tracker" So the media picker is part of Vanadium ? Or it "inherits" permissions from the calling app ? I'm trying to understand.

It made me try to reproduce the problem with a different app : I have done again all steps, replacing Vanadium by "Contacts" stock app. And indeed the edited screenshot can be selected ! So it really looks like a Vanadium issue, despite my Vanadium app having "Always allow all" for the "Photos and Videos" permission.

[thestinger]

It's a Chromium limitation Vanadium inherits from it from how it's using this.

[thestinger]

We don't know the details but have seen it before. I don't see an existing issue but often things are reported in the chat rooms and forum rather than the issue trackers. It's also often not clear if something is a bug or by design. Chromium may be intended to work the way it does but we could change it slightly.

[Saroumane]

2 observations :

I reproduce the problem with thunderbird (which do not use chromium at all, right ?) when I try to send an edited picture, right after having edited it. But when I try later (5min ?), thunderbird can 'see' the edited picture. I can't tell exactly what I did during these 5min.

When I edit a picture with Gallery Editor, the permissions of the picture change from rwxrwx--- to rw-rw---- So the 'execution' permission is removed. It looks irrelevant for this problem, but I think that Gallery Editor is 'overstepping' a bit : it's not its job to mess with file permissions, right ?