I have a form with the option to upload pics but I can't open any of them

I have a form with the option to upload pics but I can't open any of them. I've now received a message that I've reached my limit and I have to purchase more or my form will be disabled. I would rather delete this section of my form and find another way for my customers to send me pics ie. via email. How can I do this?

I have checked your account and can see that you have reached the uploads quota (105MB of 100MB allowed). Please delete some submissions with file uploads to free up space. Here is how to delete submissions: How-to-Delete-Form-Submission-Data

Prior to removing submissions, please make sure that you have downloaded the data: 

How-to-Download-Form-Submissions-as-Excel-CSV-PDF

How-to-Download-the-Submission-Files

Also, you can upgrade your account to extend the limits: How-to-Upgrade-My-Account

Let us know if you need more help.