Feat/Upload multiple files in different fields

[jackey8616]

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you written unit tests?
• Have you written unit tests that cover the negative cases (i.e.: if bad data is submitted, does the library respond properly)?
• This PR is associated with an existing issue?

Closing issues
Closes #1493
Put closes #XXXX (where XXXX is the issue number) in your comment to auto-close the issue that your PR fixes.

If this is a new feature submission:

• Has the issue had a maintainer respond to the issue and clarify that the feature is something that aligns with the goals and philosophy of the project?

Potential Problems With The Approach
n/a

Test plan
Tested with unit test with multiple decorator usage.

[WoH]

Just a question about existing coverage

[jackey8616]

@WoH This PR is also good to go. thx

[WoH]

Can you please rebase?

[jackey8616]

Can you please rebase?

Rebase completed.

[yyoshiki41]

Thank you for your ongoing development efforts!
Could you inform me when the npm package will be released?