Incomplete documentation for features such as folder upload in Box Uploader element

[Yao-Yuan]

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Environment:

• Elements version: 13.0.0

Desktop (please complete the following information):
N.A.

• OS: [e.g. Windows 10]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):
N.A.

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Steps to reproduce the problem:
N.A.
What is the expected behavior? (Screenshots can be helpful here)
Documentation provides the full overview of the features and properties that can be configured.
What went wrong? (Screenshots, console logs, or HAR files can be helpful here)
The documentation is incomplete/outdated.
For example, we are trying to make use of Box Explorer as a Javascript library. We could not find any documentation on Folder upload feature but from the code and our testing, it is working.

Link to application or sample code:

If relevant, link to file (or attach file here)

Expected behavior
A clear and concise description of what you expected to happen.
We are expecting to have proper documentation on the developer guide or github readme.

For example, we would like to see important possible properties like "isFolderUploadEnabled" ( from https://github.com/box/box-ui-elements/blob/master/src/elements/content-uploader/ContentUploader.js)
at mentioned place.

Screenshots
N.A.

Additional context
Add any other context about the problem here.
N.A.

[silent-e]

It is also missing information on the beforeUpload event.