the issue is extreme stress due to shipping from grower to seller to you and then immediately repotting it stressing it all the more ...

take a nylon or string or something.. and tie it upright ...

you interfered with the roots ability to maintain internal water pressure so it flopped... it needs a few days to pump itself up ... but it might not be able to lift itself... so if you gently tie it upright.. maybe it can become turgid again ...

all the rest are variables.. but i dont see them as important here...

ken

ps: i never had much luck with clay pots indoors ... if you have experience.. and know how to deal with it.. then bazinga ... i would also favor a pot in pot system ...

If your humidity is only 40%, you may have issues w/ this plant. They require around 60-70% and are finicky, in addition to that. A terrarium would help- if you have or can get a small aquarium you can place pot in that to increase humidity (I see them often for cheap & 10 gal should work for now.) Or buy a humidifier. I think Ken is right, the droop is from the repot & plant will recover but Ive had plants take a few weeks to get over a repot, just so you know. These plants are native to forests of southern Brazil where humidity is very high, so if it just came from a nice, humid greenhouse into 40% humidity, it could be a bit of shock for that reason as well as the replant.