How do you use Oneflow as a database for agreements?

We would like to gather our framework contracts in Oneflow. To easy share it with the organization and also set reminders for price adjusting and extending of contracts. However we find Oneflow lacking a lot. It's for example not possible to set an exact date for reminders (and change them after), the overwiew is not good and also we do not manage to add appendices after uploading the first time. How do you use Oneflow for this purpuse?