How can we upload a document to NextCloud CMIS?

Hello,

Currently, I'm using Bonita Community 2022.1 and NextCloud 17.0.6.

My company's expected is define an user task form can upload multi files into NextCloud. 

As I researched on Bonita documentation, it seems that we have some choices like: CMIS connector (but Bonita documentation doesn't talk detail about the usage of CMIS for NextCloud), Groovy Script (I tried Sardine plugin but it not working cause Sardine not found in Bonita), NextCloud's REST API (but it just supported upload one file https:/my.cloud.comapny.server/remote.php/webdav/Documents/text2025.txt....).

I still hope we have some other ways to upload files into NextCloud from Bonita Studio. 

Could someone give some advices on my concern?

Thank you so much,

Tam