IMP Considerations while Uploading large files or many files to a library

Microsoft Recommendations

If you are uploading large files--or many files that add up to a large total size--to a library, you may get errors due to the file size limit in SharePoint or timeout errors in your version of Internet Explorer.
Steps you can take to get around these errors include:

• Upload 100 or fewer files. Uploading more than 100 files at a time is not supported.
• Avoid uploading files larger than 250 MB, which is the maximum file size by default.
• If your organization maintains an on-premises deployment of SharePoint, ask the server administrator to verify or increase the maximum file size limit to accommodate the size of the files you are uploading. The default size limit is 250 MB, but it can be increased.
• For file sizes exceeding 2 GB, if you see a "Working on it" message that never goes away, follow the instructions in Microsoft Support: Internet Explorer error "connection timed out" when server does not respond.