The file upload option is not available for DAT Power on tablets or smartphones since it requires a higher resolution. When it is detected that you are using a smartphone, tablet, small laptop, or a desktop with a low resolution, the file upload button will be removed.
Using DAT Power from a desktop computer with a higher resolution will resolve the issue.
Treat this case like a missing Rate column case.
Have the user sign out and sign back in.
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Logging into another account sometimes fixes this as well (Go To Assist)