From Screen Rant:
Marvel Studios co-president Louis D’Esposito posted a message to his official Twitter account, wishing Waititi and his Ragnarok cast/crew the best on the project, now that principal photography is underway. Meanwhile, Ant-Man (and future Ant-Man and the Wasp) director Peyton Reed likewise sent his regards to Waititi – who then responded in his customary good-humored manner (see below).
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Congrats to @TaikaWaititi and @bradwinderbaum on Day 1 of principal photography on THOR: RAGNAROK! (Taika, remember: explosions!) #Mjölnir
— Peyton Reed (@MrPeytonReed) July 4, 2016