Can upload incorrect file to the wrong content type but can't delete

[jeffhhk]

Here I was confused about the order of operations and made a mistake:

I have files named both notes.tsv and edges.tsv uploaded to the KGX Content Type=edges field. Now I can't delete.

Here is what I did:

1. Select KGX Content Type=nodes
2. Browse to file and select nodes.tsv
3. Click upload and wait
4. When the upload was finished, nodes.tsv was still selected under "Browse..." but I was so surprised by this that I didn't notice at first
5. Select on KGX Content Type=edges
6. Thinking I was going to select a file, clicked on "Upload". What actually happened was that nodes.tsv was uploaded for a second time into the KGX Content Type=edges field.
   . . .

Possible solutions include:

• Disallow multiple files to be allowed to one KGX Content Type
• Allow a delete button

[RichardBruskiewich]

Thanks @jeffhhk, we have in mind to implement issue #36 which should provide a means of repairing incorrectly tagged uploaded files.

That said, we'll review the UI and upload code to see if the file type shouldn't just be inferred from the file name, since other software (e.g. KGX) constrains file content in that fashion (@kbruskiewicz we should take note of this)

[RichardBruskiewich]

Related to #22

It may be helpful for us to immediately enhance the upload form to all for repair of a file set in progress, or to redesign the form to make it more fool proof from end user faux pas.

[jeffhhk]

As a point of clarification, I would not expect the ability to delete after "Done Uploading" operation has taken place.