So I've been trying to copy images in an existing, writable directory. Here is a Patrick meme I created to avoid getting insane.

I know this.
If you for example:
- add yourself to a specific group
- allow that group to write to a directory
- restart your shell/terminal

and you still can't write to it.

You can in this case either:
- Restart your computer (logout + login may work too)
- Run "$ su -" (gives you a session where it should work)

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Also a nifty trick:
Use "# chown g+s DIRECTORY -R" to not change the group when creating files/folders.
Especially handy when you copy files as root into a directory and cant delete these files with you regular user/group.

Check acl too, basic permissions are basic

@andros705 nah, it's a random directory created on the fly, with chmod 775 by default which is more than fine to begin with, and all of that inside a Laravel project

While Laravel, with such configuration, can write without trouble in this directory, Intervention Image, an external library, CAN'T. WHY.

Ever heard of SELinux you absolute muppet?

I bet you've either forgotten to (re)label your file contexts or are writing to a segregated temporary directory (i.e. your /tmp isn't actually in /tmp.)