SgtSurehand
correct me if I'm wrong)
Yes, you are wrong. What you are describing is simply copying files. It seems to me that you want to have something like QubesOS but in GOS. In QubesOS you can copy files between VMs, but there you have a parent host and an application VM. GOS was never designed in this way. You expect implementation of a solution that will only weaken the security and privacy of GOS. Copying with permissions? How is this supposed to work? If an untrusted profile is compromised, will it be able to copy malicious files to other profiles? Is this what you want to achieve?
You were already told that you can achieve this in other ways: you can use some trusted USB drive, microSD, ProtonDrive etc.
btw. GOS gives you interesting possibilities, because you can run e.g. Signal on one profile, switch to another profile and if someone calls on this Signal, you will be able to answer the call from the second profile.