All folder & files in data have www-data and 770.
I tryed again to share a link. Same as above
What did you follow for the installation, do you have your rewrite rules enabled, are you using an .htaccess file
for example i have a docker installation of pydio that works just fine and i used that
RUN chmod -R 770 /var/www/pydio
RUN chmod -R 777 /var/www/pydio/data/files/
RUN chmod -R 777 /var/www/pydio/data/personal/
you can omit the RUN
here the dockerfile if you need indications.