You might just need to do the IONOS directions found here: https://docs.moodle.org/403/en/Apache
You have to be careful depending on the type of contract you have with IONOS. IF it is shared hosting, they give unlimited space, BUT NOT unlimited file names. Their fix is going to add HUNDREDS of file names, and consequently, I had to REMOVE a lot of stuff I was storing there. Running my own in-house 4TB NAS for storage, now.