Filename timestamps contain invalid characters

[newhinton]

The app tries to save pdf's with ":" characters as separators for time. This breaks saving the file.

[mars885]

I remember encountering this issue during development and, as far as I remember, I successfully resolved it. However, it does not look like it based on your comment. What API of Android OS are you using?

[eknoes]

I can reproduce that on a Pixel 3a with Android 12!