Thank you for reaching out.
JIRA can be imported with issues from other applications in CSV or JSON formats, where you are able to map attachments/files to issues, one time the files are in an accessible open URL (Like Google drive, for example):
Also, there are some third-party apps that provide you with a direct integration between JIRA and some other applications, including JotForm. The one below is one of those apps:
Let me know if you have any questions.