There are two related bugs when trying to simultaneously send more than one photo with secret timer enabled.
Bug #1:
There is no way to see and manage timer status for any of the photos if there are more than one photo sent at a time. (see screenshot #1)
Bug #2:
If I setup timer for single photo and later add another one and send them both, in 100% of cases they have problems with delivery:
Photo with the secret timer is not sent correctly. I attached screenshot how it looks in Unigram on a sender side. Receiver side does not see image with timer at all.
Steps to reproduce
Open 1-to-1 regular chat.
Drag-n-drop image into the chat
Setup secret timer for this image
Drag-n-drop additional image into the chat (so we are going to send them both)
Now you cannot view or change secret timer status for any of the two images (Bug #1)
Press Send button (two images are sent, first one has timer invisibly enabled)
After few seconds of animation you can find 1st image failed to send. And there is some error icon in the right bottom corner of the second image. (Bug #2)
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This is definitely a BUG!
Previous Unigram version could send such images well.