Hello,
 
Thank you for reaching out to us.
 
When using the Allow multiple files option of the File Upload field, you can limit the files per type or size but not on the number of files uploaded. Such option is not available at this time.
 
You can find more information here about uploading multiple files through the form.
 
As an alternative, you can add and use multiple File Upload fields (as many as you need) without allowing multiple files upload.
 
Please also keep in mind that there is a 150 MB limit size per File Upload field and that you can also set a file size limit for uploads.
 
Let me know if this is what you were referring to and if you need further assistance.