adobe sign upload of document

Hi,

I am new to adobe DC and have bought it mainly to use the electronic signature section of the software. When I click on "ready to send" to upload and add recipients it gets to about 12% and say "could not send, an error has occured please try again later". This is not a very helpful error message!

I have tried this with multiple pdf's and get teh same error. I should imagine there is probably somthing that I need to set to allow this to work. I have been through the FAQ's and tutorials and it would appear I am doing everything correct. Please help.

Thanks.

Kind regards,

Andrew