Adding app destinations to the Share Sheet in IOS…. Can this be done?

I hate asking questions as I feel someone must have asked this before but if they have, I can’t find it. Using an iPad Pro running 15.7

So if I am in, say OneDrive in Office and I want to do something with a file. Using the “Share” function allows me to send it via email or various message apps, other options might be printing or copying a link, a variety of things. This is all accomplished using something called a Share Sheet. I would like to be able to edit some of the destination apps. I use an app called GoodReader. I would like it to be available to send to on the Share Sheet. Select a file, or files, and move or copy them to GoodReader. Can’t figure out how to do that.

I don’t understand how some of the apps on there or functions on there, make it on there! My washing machine app shows up! What is that doing on there? Something’s just make no sense!

Your help would be appreciated!