According to the dimension of your data, you have 2 possibilities:

JupyterLab built-in upload feature (file size < 15MB)

You can use the Upload button from the JupyterLab Files tab view (as showed in the above picture). This feature will allow you to upload a single.  If you need to upload more than a file, you can create a compressed archive (tar, zip, etc...), then upload and decompress it later via Workspace Terminal

FloydHub dataset (file size up to 100GB)

You can upload your code and data as a FloydHub dataset that you can attach to your Workspace.

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