Thank you @yuryg and @metta.
1. I had no idea you could move it to the left side, I thought it was right and bottom only, thanks @metta! 2. So far I've used tabs, but have been having an issue with names displaying fully or enough at characters least, so I am going to try the list, it will take some getting used to it being on the bottom though. 3. I have Dropbox Professional, so I already place a password on shared links, except when sharing from the Public folder. I think I'll use the Dropbox link because having to add two attachments for one file will require me to remember to add it when I get to the other platform, which I know I'll forget to do.
For anyone else who might be using Dropbox links, I found that Dropbox online gives you the option to open the file in Finder/Explorer so not too hard to open the local file.
@metta Thank you, I'll read those now.
macOS 10.14.4 Windows 10 1803