Hi AndreaCompton1,
I'm Rodrigo and I will help you.
Yes, you can share a link to a file on OneDrive, it is easy and simple.
Move the file to your OneDrive folder, right-click the file > Share > Copy Link
On "Anyone with the link can edit" (Globe icon) you can edit the permissions
That's it, the link is already on your clipboard and you can send it to anyone you want.
Wait for the file completely uploads before disconnecting from the internet or turning off the computer, when the upload completes, you can see the green check next to the file.
After uploading, your device doesn't need to be on or connected for the other person to access it.