How to Import MBOX files to Gmail on Mac by maintaining the data integrity?
Gmail comes first in mind when a person is migrating to any Webmail. So, if you are willing to import MBOX to Gmail Mac then you are at the right place. Here, we will tell you the process of importing all the emails with attachments from an MBOX file to your Gmail account on a mac device without altering a single piece of data.
read more:- https://www.macsonik.com/blog/import-thunderbird-mbox-to-gmail-mac/

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chris white commented
MBOX to Gmail account is not an effortless job to function as the user may get damaged their files. The user can make use of MBOX to Gmail Converter software it can simply make the MBOX data imported directly converted into your chosen Gmail account without facing any kind of error.
More Info:- https://www.softakel.com/mbox/gmail/