Through some trial and error and some further digging, I figured it out. Here's what works:

URL: [entityform:field-file-upload:0:file:url]

Filename: [entityform:field-file-upload:0:file:name]

Upload date: [entityform:field-file-upload:0:file:owner:created:short]

Increment the 0 to return more files from the multi-value array of uploaded files.

Through some trial and error and some further digging, I figured it out. Here's what works:

URL: [entityform:field-file-upload:0:file:url]

Filename: [entityform:field-file-upload:0:file:name]

Upload date: [entityform:field-file-upload:0:file:timestamp:short]

Increment the 0 to return more files from the multi-value array of uploaded files.

Once I had the basic syntax, the Drupal List of Tokens page was particularly useful.