A Microsoft file hosting and synchronization service.
Hello, thank you for reaching out to Microsoft Q&A.
With a Microsoft account (without an Office 365 subscription), you get 5GB of OneDrive cloud storage and 15GB of Outlook email storage.
If you synced your Gallery (Photos & Videos) to OneDrive and it exceeds the 5GB limit, syncing will stop, and you will no longer be able to send or receive emails in Outlook.
However, the photos and videos in your System Gallery will not be deleted. Only the backup syncing will be stopped.
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In this situation, if you have exceeded the storage limit and would like to upgrade your storage,
Open an incognito tab and sign in with your Microsoft account here to buy the OneDrive storage plan that suits you.
https://www.microsoft.com/en-us/microsoft-365/onedrive/onedrive-plans-and-pricing
Once purchased, it will take 2-4 hours for the storage to be reflected in your account.
You can then open the OneDrive app and go to the account section to view the total storage space used and the remaining space.