SAINTexpress using Scaffold export file


I’m trying to analyze IP-MS data via SAINTexpress through APOSTL Galaxy. I’ve used Galaxy for DESeq2 RNAseq, but for some reason am having problems with file types:
I have an exported Scaffold Report .xlsx file directly from Scaffold via a collaborator. This file cannot be recognized by Galaxy in drop-down menus in published workflows.
I converted to .txt, as implied, and to .csv; both appear in the drop-down as input files, but I get error messages (“History does not include a dataset on the required format/build”) when executing.

Any suggestions?