This functionality is available on Onshape's browser, iOS, and Android platforms.

You can import (upload) any type of file into Onshape, either into an existing and open document, or as its own document (from the Documents page). For a list of supported files, see Supported File Formats. You can import files from your desktop and also from integrated Dropbox, Google Drive, or Microsoft OneDrive accounts. See Integrationsfor more information on integrating cloud apps with your Onshape account.