https://eeas.europa.eu/sites/eeas/fi...estions_en.pdf

15 I have a valid long stay visa/residence permit for a country that is part of the Schengen area. Do I need another visa to travel to other Schengen states?
No. A long stay visa or a residence permit issued by a Schengen State allows you to travel or stay in other Schengen States, while respecting the maximum duration of a “short stay” (a stay of "90 days in any 180 day period").

16 Do I have to present any other document at the Schengen external borders apart from my travel document with the Schengen visa?
The short-stay visa does not automatically entitle you to enter the Schengen area. At border (or during other controls) you may have to show the visa but also provide additional documentation, for example information on that you have sufficient means to cover the stay and the return trip. It is therefore recommended that you carry with you copies of the documents which you presented when applying for the visa (e.g. letters of invitation, travel confirmations, other documents stating the purpose of your stay).