If you want to migrate OLM to Gmail, you can try third party software like OLM to Gmail Migration Tool. There is no file size limit for importing OLM files into Gmail. This software can import OLM mail items such as attachments, pictures, calendar, contacts, etc. OLM to Gmail converter supports all versions of MS Outlook such as 2019, 2016, 2013, 2010, 2007, 2003, etc.[table][tr] [td]
https://www.kdetools.com/olm/gmail/[/td][/tr][/table]
