Yes - we are having issues too. It would never recognize our Source Sheet / find attachment when I was setting to use the most "recent" attachment. Once I switched to "Name" and typed the full name out, then I could see the option to select if there are headers for the xlsx file and which row/tab the data begins on.
Then I could select to map my columns too, but not when it was set to Recent.
I have been battling for two hours with this. The problems always occurred when I came to the mapping step, where I was told I hadn't selected a source. In the end I realised that my .xlsx file contained two worksheets. Once I deleted the one I didn't need, everything worked.
My problem is a little different, it's not uploading my target sheet and not adding rows to the target sheet as they are added to the source sheet. I've been back and forth with support. They are telling me to use replace instead of merge but I can't just replace all my data because my team is updating rows as data comes in. Super annoying.
If you haven't already, please contact Smartsheet Support like@Hammermill21did, providing them with as much information as possible so we can look into each of your issues.
Helpful details include the following:
Browsers you've tested and if it happens on multiple networks
Email address to the user who owns the workflows
Screenshots of each page of the workflow setup
Error Verbatim or screen capture
Smartsheet sheet unique name or URL
A copy of the file you're having trouble with (file type / size)
Timestamp of the last time you encountered the issue
Was this working before? If so, when?
A copy of the workflow run log (click theLast Run date > upper-right menu icon > Save run log.)
Downloaded Activity Log from the source and target sheets
In the meantime, you may also want to review theTips and Best Practicesfor Data Shuttle in case that helps.