[Bug]: Share permissions are not properly grayed out if sharee does not have them

⚠️ 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

Since the sharee does not know their permissions, if they reshare with someone else, they are met with an error that is very confusing. Then they have to trial and error their way to create a share with the correct parent permissions.

Additionally, on web and Android, you can see all permissions are enabled even though user3 only has Share permission. When sharing with user2, user3 does not know which permissions they are allowed to enable or disable.

On iOS, you can clearly see which permissions are disabled for resharing:

iOS behavior should be the same on all platforms.

Steps to reproduce

1. Be a sharee with limited permissions
2. Try to share to someone with full permissions
3. Get an error

Expected behavior

Should be properly indicated which permissions you have to reshare

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

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

Start by reproducing the limited-permission reshare flow from the listed steps, comparing the web and Android permission controls with the iOS behavior shown in the report. Trace the share-permission entry points across the affected platforms. Done means unavailable permissions are visibly disabled and resharing no longer requires trial and error or produces the confusing error.