How can I allow multiple image uploads in my form?

Ich will meinen Nutzern die Möglichkeit geben mit mehr als nur ein Foto zusenden zu können in einer Mail! Wo kann ich das einstellen oder welches Widget empfehlt ihr da?

From how I understood it, you're asking if we have a widget that allows multiple file (image) uploads.

If that's correct, you won't need a widget. The regular File Upload field should suffice.

Just ensure you will turn on the Multiple Files option:

And while you're at it, I recommend you read the following guides when working with the File Upload field.

Related guides:

Changing-the-File-Upload-Size-Limit

Which-file-types-are-allowed-for-the-upload-field 

But if you really prefer to use Widgets, then just go to the File Uploads category and pick one: https://widgets.jotform.com/category/file_upload