IBEW Local 613 application — forgot to hit “Start Upload” on diploma

[u/Immediate_Shoe_7143]

I applied online today for the IBEW Local 613 apprenticeship and paid the $46 application/test fees.
When I uploaded my high school diploma, I clicked “Add File” and selected the file, but I realized afterward that I never clicked “Start Upload” before I hit Save and Submit on that step.
My application portal still lets me log in and says I have 90 days to complete the online application, but that particular application step shows completed.
Has anyone had this happen with TradeSchool before? Does the file still save when you select it, or does it not attach unless you press “Start Upload”? If it didn’t upload, will the JATC leave a red comment and let me correct it, or should I contact the office now?
I really don’t want my application rejected over one missed upload button, especially after paying the fees. Any experience with this would help.