can I make a free website where I can save files and give them back in processing on the mobile phone?
Hello,
Some details would help.
Initial thoughts:
https://www.hostingadvice.com/how-to/best-file-hosting-services/
12 Best Free Website Hosting Compared (2021)
I have also set up a “home” server on my personal PC in the past.
:)
and how can I combine something like that with processing?
Do you need a database like thingy to store some data and retrieve from your sketch when you need it?
If that is the case then you should look into this
yes but i don’t know how to upload / check files
I personally use MongoDB in my javascript projects. It has enough free features for a beginner. But you can find the getting started page for JAVA here. Hope it helps!