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Q: how do get back on the platform without clicking restart
A: use a flying mod like precision flight
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Q: how do you copy the mod
A: subscribe to the mod and in the mod manager click the map and press "Make local copy"
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Q: no collision in custom model
A: go into the properties of the model and ensure "Collide" is set to true
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hope this helped! (i'll answer other questions that y'all have in the comments)