Israel, America and possibly other countries have all developed VTOL drones. If you know how to develop UAVS developing VTOL is not hard your only real limitation is the payload. Iran might have developed a VTOL UAV but I doubt its anything special.
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Mortar shell fired from Gaza at IDF force operating by the border, no injuries reported (Haaretz)
from the article: Report: Iran has built advanced drone that can take off vertically