If the uploading file name contains a single quote in it like (filename = "This is your's file.pdf")
Request URL
<Sitename>/_api/web/getfolderbyserverrelativeurl('/folderName')/Files/add(url='This is your's file.pdf',overwrite=true)
Error
{"error":{"code":"-1, Microsoft.SharePoint.Client.InvalidClientQueryException","message":{"lang":"en-US","value":"The expression \"web/getfolderbyserverrelativeurl('/Shared
Documents')/Files/add(url='This%20is%20your's%20file.pdf',overwrite=true)\" is not valid."}}}
Please help as soon as possible.