Uploading files and physically works, via an url it does not

[Achelos]

Using 4.2.2

So, I have used the setting where I can, physically, save the files to a directory (somewhere above public_html). This works just marvelously. However, when I want to choose an url to save a picture, vB says to me it has failed to create a temporary file.

The same goes for Avatars. However in this case I go to "User Picture Storage Type" to change it to "filesystem" (as in my attachments), I can't seem to toggle that.

I've tried finding it out (even trying to see if I could toggle this in the DB for vB), but to no avail.

So, effectively - I have one problem (saving an image physically via an url), in 2 sections of the forum.

Could anyone perhaps assist me?