Drop zone for "Upload data for this table" is whole page

[chrisala]

If you drag and drop a document into anywhere on an activity form with a table, all "upload data for this table" uploads will be immediately triggered with that document.
Best case, this just produces errors in MERIT as it can't use the document to upload data, but if a complex spreadsheet is being attached, the sheet will be parsed once per table on the form, which can cause memory (and thread) pressure on the application.