If you've connected your SkySlope to your Open To Close account, you can upload any of the documents you have in Open To Close to SkySlope, as long as it's listed as a Sale in SkySlope. Here's how.
Select the property you want to send files to SkySlope for and go to the Documents tab. Find the document you want to upload to SkySlope and click on the drop down triangle to open up the options. Select Upload to SkySlope.
You will see a new window confirming that you want to upload the document to SkySlope. Click on Yes to finish the process. You should get a message stating that the document was successfully added.