Okay, so I'm thinking, to fix this, it would be easiest to go into my file manager and change that folder that has all my LRG pics in it, from Product Large TO large.

Right? Then it should pick up my large images?

Also, I'm not clear on another thing.
I go to my category/product
I want to add a pic for that product.
Am I supposed to upload the photo right there on that page or use the box for get file from server?

I've been uploading it right there on the page. My question. Where am I supposed to upload it to? Which place / folder in the images?

Should it be the smallest image I have of that pic?
Should it be uploaded to the same folder as the MED pics?
The main folder?