I'd try asking for help over here.
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_word-mso_amobile-mso_365hp
--please don't forget to Accept as answer if the reply is helpful--
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Im having problem opening an edited file in my Samsung Galaxy S4 with Word 365. The file was from my laptop which also have Microsoft 365 installed. I transferred the file to my tablet, opened and edited without any issues. However on opening the file after editing and saving. It says: "Word found unreadable content.... do you want to recover?" When I clicked OK, it simply says: "Sorry, something went wrong... cant open"
I'd try asking for help over here.
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_word-mso_amobile-mso_365hp
--please don't forget to Accept as answer if the reply is helpful--