Problem: integrity check / delete file

1:
Here is the list of files that failed the integrity check.

What should I do with them?

2:
I have not opened it with a sync client. Neither does the viewer from my point of view. Since the person is currently abroad and has only the SmartPhone with him.

3:
Muss one extra install an app on the SmartPhone?
I want the visitors to be able to comment on the images without an additional tool.