Can't upload Files with UPPER CASE File Endings

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Following Problem, if Users try to Upload for example picture.JPG, an undefined error in Browser appears, i get no error in nc log. if Upload ist with pictur.jpg, no problem and upload finishs.

Nextcloud version : 20.04
Operating system and version : Ubuntu 20.04
Apache or nginx version : Apache 2.4.25)
PHP version: 7.4

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Upload File example.JPG from PC via WEbinterface
  2. Error in Browser

The output of your Nextcloud log in Admin > Logging:
no error in nc log.

Solved. Wrong nginx config .