Hi there

I'm looking to put something together using Zoho potentially.  What I need to do is for our employees to be able to login either to a website with Zoho forms integrated or to Zoho forms app.  

1. Employees need to be able to fill out forms, like mileage forms, risk assessment forms, job sheets including pictures.

However, one key feature we require is for the forms to be available offline, for them to be able to complete the forms (offline) and for these to be able to be synchronised back up when they're back online.  Our workers often work in rural locations where there is no wifi or mobile signal.  
Is this functionality possible?  I have only been able to see how to design forms offline, rather than submit them?

2. Ideally I want to be able to create job packs in the office which contain drawings, job information etc that I can then assign to an employee and for the completed job packs and associated forms to write to an Excel Spreadsheet, and ideally also create a printable PDF of the job sheet and forms.
What products should I expect to use for this process?

3.  What costs would be associated with this setup.