can I make a free website where I can save files and give them back in processing on the mobile phone?
Some details would help.
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