Permissions error mounting USB drive

[ian_r_h]

Thank you, Trinidad.

1) What are you copying?

It's a .tar.gz file freshly created by Archive Manager (from a right-click), and tested by extracting back to the HD first.

2) What Linux software are you using (not the OS) to accomplish the copying?

New to Linux here; otherwise I would have also tried from the terminal.

I'm using the default File Manager for LL (Thunar, as I understand it).  Again, right-click Copy from HD and then left-click, Paste to USB stick.

3) What do you want the data copied to the USB to do or be?

I'm not sure I understand the question.  I'm just trying to copy the .tar.gz archive to the USB stick.  I would have expected this to be a straightforward data transfer.

Update:

As said in last post, it copied OK from another LL laptop (different make and model), after using the Menu/Settings/Disk menu to reformat the partition to default and sudo chown -R ian: /media/ian/NAME/ to change permissions from root to me.

Update 2:
I have also successfully copied from the HD on this laptop today, using a different USB stick (same make and model, bought at the same time), on a different USB port on the machine.

This also follows, of course, a shut down overnight and restart this morning.