[Bug]: drag and drop with windows compatible file names shows unspecific error

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

• enable windows compatible filenames
• upload a file with "<," in it as drab and drop
• see unspecific error message

Steps to reproduce

see above

Expected behavior

see correct error message that "<" is not allowed

Nextcloud Server version

30

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

happens on c.nc.c

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

Reproduce the drag-and-drop upload with Windows-compatible filenames enabled, using a filename containing "<,". Start by tracing the upload validation and displayed error for this case. Done means the user sees a specific message that "<" is not allowed rather than an unspecific error.