Hi there and welcome
this Excel file, was it stored on your iphone or online?
ok, did you ever connect it to iTunes and perform a backup?
Please let me know
Ok, so you mean there may be a recent backup of the iPhone in itunes made at the time before this crash happened?
ok, then you will need to restore the backup into the iPhone which will return the phone to how it was at that date.
To do this, connect the iPhone to the computer and open itunes
Then click on the iPhone when it appears
Select Restore Backup in iTunes
Choose the date and complete the restore from the backup and if the file is in the backup it will then be added back to the phone.