Windows filename compatibility warning in Seafile Client: how to see which files are causing the problem?

In this German post, it is said that you can make the column larger in the error window (I haven’t tried it myself) by putting your mouse to the left of the column heading.

Another idea would be to use the command line and look for forbidden symbols, which are:
: < > " / \ | ? *
(Naming Files, Paths, and Namespaces - Win32 apps | Microsoft Learn)
Admittedly, this is not a solution from the seafile side