Offer attaching from the contacts view CRM
Maybe I am missing something but lets say I attach example.pdf to a contact in CRM then later send them an email and wish to attach example.pdf to the email it would be very smooth to attach right out of the "attachments" component on the contacts page. At this time I can attach direct out of zoho docs, but what if the file wasn't uploaded through Zdocs, taht means upload to Zdocs, then switch to the contacts page and attach from Zdocs. Extra steps.
Why not make an attachment through the contacts page just go to Zdocs, then it can be found in the Zdoc file manager and from the contacts page. I'll bet when you attach a file through a contact it goes to Zdocs somewhere, we just need it to show in Zdocs and the contacts page.
While Zoho CRM has a bit of a learning curve it performs well now and can be killer in the future with just a few of these little tweaks. This and multiple email addresses for a contact seem to be the low hanging fruit.