Send Email Attachments from Google Drive

I’m quite interested in the Mail Merge Google Add-on, but I’d like to clarify some aspects related to attachment access. 1. Given that I’m not the owner of the Google Drive files (I only have shared access with editing permissions), I’d like to know if it’s possible for me to utilize the mail merge add-on to send files created by others to recipients. 2. I’m curious about how access restrictions set on files within Google Drive might impact individuals when they open attachments in the emails generated by the mail merge add-on. Could you provide insights into this? 3. In the context of file sharing, I’m wondering whether recipients need to possess Google accounts or specific access rights to access shared files. Alternatively, does the Google add-on facilitate the download and attachment of these files directly to the email, bypassing the need for recipients to have such access or accounts?