OK, this is caused by a known bug. There’s a potential fix in the latest beta version, 1.24.1 (513). If you want to test it out, you can join the beta program: https://play.google.com/apps/testing/org.inaturalist.android You should be able to upload those observations after updating to the beta.
I updated to the Beta Version 1.24.1 (513) but the error is still the same.
I tried to send the logfiles again, but the Email was rejected, because the total file size was to big for the google mailbox.
Which of the logfiles are needed the most?