@ahummel After experience many minor Errors.
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Indexing not working
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Pictures are not displayed
I solved most issues by using Lamp Stack and installed dokuwiki manually on it with php 7.4.
For me it seems there are some issuse with the imported cloudron base container. I am new in packageing cloudron apps and could not identify the source docker file
So i solved it via lamp stack it is not optimal cause of the unneeded mysql and redis components.
Regards ahummel