A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Dea O
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
Based on our research to upload files to SharePoint, you may consider below things:
- storage.
You can check your total SP storage from SP admin center, Active sites page top right area. Please be noted that no matter how many site collections created, they all share the storage here.
Related KB:
https://learn.microsoft.com/en-us/sharepoint/manage-site-collection-storage-limits https://learn.microsoft.com/en-us/office365/servicedescriptions/sharepoint-online-service-description/sharepoint-online-limits
- SP limitations
SP has some limitations on files uploaded, such as file uploading size should be less than 250GB, file name shouldn't contain invalid characters, file path length should not exceed 400 characters, etc.
For details of SharePoint limitations, please check the KB before uploading.
https://support.microsoft.com/en-us/office/restrictions-and-limitations-in-onedrive-and-sharepoint-64883a5d-228e-48f5-b3d2-eb39e07630fa#filenamepathlengths
- How to perform the uploading.
For large data migration, we suggest you using SharePoint migration tool.
https://learn.microsoft.com/en-us/sharepointmigration/introducing-the-sharepoint-migration-tool
If there is any misunderstanding, please feel free to correct me.
Have a nice day!
Best regards,