If you are using a Repeating Photo control in your form, you have the option of uploading the photos to a SharePoint Picture Library or a Google Folder.
HOW TO UPLOAD REPEATING PHOTOS TO SHAREPOINT
Start by adding a Repeating Photo control to your form by clicking on it from the Controls panel on the left side of the screen. After adding the control, please scroll to the Destination section in the Properties panel to the left side of the screen and click ADD DESTINATION.
The window below will be displayed on your screen. Please select the SharePoint Picture Library option and then copy and paste the Picture Library URL in the URL field. Click Done and close the window.
Please note that the mobile user will be prompted for credentials once they open the form on their device. If you want to avoid this make sure to attach the credentials in the form.
SAVE & PUBLISH your work before exiting.
Please make sure that the link you are adding ends with /thumbnails.aspx (e.g https://MySharePoint/MyLibrary/forms/thumbnails.aspx) and that the SharePoint library you are uploading to is a Picture Library. Please refer to this article released by Microsoft for more help on creating a Picture Library.