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You can't upload this to a stndard Yola page using their e-com widgets as they are.
Yola will be releasing their new e-com system soon and this will allow such a task.
In the meantime I suggest you have a look at ecwid.com and this will allow your needs. Free for less than 100 items and approx $16 per month for more than 100 items. Files can be uploaded as excel csv or tt file among other types.