Sorry, we don't have that option. Integrating with file hosting apps such as Zoho Docs, Dropbox, Drive etc. is a part of our immediate product roadmap.
While we're at it, you may try this workaround to upload images from your Drive:
- Right click on the image you want to upload.
- Select Copy Image.
- Head over to the New Post window and click Control and V (for Windows) or, Command and V (for Mac) to upload the image.