Can I delete only the uploaded data ?

can i delete only the uploaded data ? So that i can control my size limit.

It is required to delete the submission in order to delete the uploaded file to the submission. However, you may edit the form submission and remove the uploaded file if you have enabled the Multiple File upload option for the file upload field. Please be noted that the notifications/auto-responder might be sent again when the form is submitted again after editing.

Hope this information helps!