Thank you for your question.
You can use our contact our Form Widget for your customers to submit their contact details to you. However, it is not posible for them to upload content to your website and they will need to email you the content which you can then upload manually to your site.
Adding your own custom form within the Sitebuilder is easy with the
Form Widget. The flexibility of this widget enables you to to create
custom line items, to make gathering information and communicating with
customers a valuable experience. We have an excellent tutorial which
will walk you through this. Here is the link: Adding forms to your site with Yola's Form Widget
I hope that I have answered your question. If you need any further assistance in future then please do not hesitate to contact us.