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Of course, you can upload multiple files in the same form, just add the upload file field and then set the allow multiple option to ON :
You can also change the upload size limit, refer to this guide to do it :
You have a limit of 1GB per file, in this case you can upload unit 1GB in the same form, with multiple files.
Hope that helps.
Let us know if you have more questions, we will be glad to assist you.