The simplest approach is to cooperate with the distributors as to providing them with the necessary documents/info. It is worth to add to the contract with the distributors that they are ultimately responsible for the registration of the product in their Territory (and will bear the fees).
Acknowledging that this is the most common global approach to device regulation in countries for which most devices are imported, we still have a problem with it.
Our experience and observation is that distributors who are made responsible for regulatory matters on a manufacturer's behalf, have conflicted motivations in regard to providing full feedback to the manufacturer regarding regulatory interactions and reported events.
And, distributors have undue power in such a relationship, because they "own" at least a significant part of the manufacturer's access to their national market. Depending on the distributor's relationship with the local regulatory authority and (in the real world) the extent to which the local system is dependent who-knows-who and on informal motivational payments, that "ownership" may be complete, with any effort by the manufacturer to change or correct a well-connected distributor doomed to failure.
We vastly prefer selling into countries where distributors have
no responsibility or role in the regulatory system, and the regulatory authority interacts directly with us as the manufacturer. We never want a distributor to be responsible for our regulatory status in their country.