Ninja Forms - File Uploads Addon 3.3.22

*Bugs:*

* Critical security flaws which could allow file extensions to be changed and files to be traversed (Props [Jasper Weijts, Onvio](Onvio - Uw informatiebeveiliging naar een hoger niveau))

*Changes:*

* Attachment ID mergetag variation to be used when saving file upload to the media library, eg. {field:file_upload_22:attachment_id}

Changes:

• Compatibility with form templates in Ninja Forms 3.2.23
• Use file extension whitelist to restrict the file upload select box

Bugs:

• upload_max_filesize php.ini config defined in units other than MB not working
• Dropbox connection removed if site cannot access Dropbox temporarily