Sometimes (it's very random) media from scheduled album is posts not fully, it can be 1 or 2 missing media (photos or videos). For example I schedule album with 10 photos and after it posts I see only 8 or 9.
This is API issue because I get that problem not only on Telegram for iOS but on Telegram Desktop too. For Telegram Desktop only app restart helps but for iOS sometimes restart doesn't help and I need to "Reset holes" in debug settings.
This issue appear at least since 7 October 2019 (first post about it in messages with my friend have this date).
Steps to reproduce
Schedule album with 5-10 media
Wait until it posts
If random at your side you will see that not all media from album is showing
Telegram Desktop if you try to replace a file in schedule and leave the page. it'll stop uploading and file will corrupt to last version. Like uploading a 100MB file would be troublesom. for now, if you want to replace a file in schedule, you have to stay on page and keep telegram open
D
Deleted Account
Issue is still here and can be reproduced more likely if you schedule 10 media. Only 9 will posts (visually) and 10 shows only after client restart (Telegram Desktop).
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if you try to replace a file in schedule and leave the page. it'll stop uploading and file will corrupt to last version. Like uploading a 100MB file would be troublesom.
for now, if you want to replace a file in schedule, you have to stay on page and keep telegram open