https://community.fabric.microsoft.com/t5/Desktop/The-field-FileLeafRef-Suffix-of-the-record-wasn-t-found/m-p/1612113
Solved: Re: The field 'FileLeafRef.Suffix' of the record w... - Microsoft Fabric Community
Jan 25, 2021 - probably some column name in the excel file is changed which is used in PQ and that's why it is failing. Go thru each Power Query step and check at
the field