Post your Sentinel export so someone can take a look at your programming:
In Sentinel. click on the drop-down File menu & select "Export to hpe file (Favorites list).
Select any and all Favorites lists then proceed with the export.
Save the file created to a location on your PC that you can get to.
Open Windows Explorer (called File Explorer on Windows 10)
Right click on your exported file & choose Compress to ZIP file. (On earlier versions, you may see, instead, an option for "Send To". When you select that, you'll see an option to send the file to a compressed (zipped) folder.)
Once you have exported & zipped the file, then you can attached the zipped file to a post.