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When in an open container in the P2/Conversations product, sending features will be done from the [+] Button next to the chat bar at the bottom of your screen.
Once you click the [+] Button you will see a pop-up with the options to send a Pull or a Push (DocuSign or Adobe Sign will also show here if enabled on your account)
Select the desired feature; Pull to collect, Push to send.
Complete the setup of the feature and send.