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When uploading files and folders, you need to be aware of the name length. SharePoint allows up to 260 characters for the total length. But, let’s be practical, the shorter the name, the better.
This could be for a number of reasons. Try the following:
Yes. For more information, see more here:
https://support.microsoft.com/en-us/office/require-approval-of-items-in-a-list-or-library-cd0761c4-8c3f-4ea2-9435-13c28aa23d08#ID0EACAAA=Classic
For more information:
https://support.microsoft.com/en-us/office/approve-or-reject-items-or-files-in-a-site-list-or-library-d5931756-5315-4c4a-b89f-18947b6f7305
Yes, for more information see more her:
Avoid using the following characters in files and folders:
~ " # % & * : < > ? / \ { | }.
(Leading and trailing spaces in file or folder names also aren't allowed.)
Microsoft SharePoint knowledge base has a great introduction page. For more information, click here:
https://support.microsoft.com/en-us/office/introduction-to-libraries-7d4221d9-8fb9-40d5-8441-2374c84b5e26
Yes. See Restore Items from the Recycle Bin wiki.