Here is what I’m trying to replicate:
most likely is a part tweening infinitely but if you want to do that the only way i know is to take a texture, put it in a while true do loop and edit the offsetstud x and y values
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As @Deternity said you could use beams, if you don’t know how they work, here’s a tutorial that might be helpful.
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Beams and or TextureOffset can work for this 
In order to make moving lava texture, it was required a Beam as @Deternity said and 2 attachments on each part.
And just for a bit more ‘realism’ I’d suggest having 2 similar beams, moving at slightly different speeds in the same location. It gives a more lava flow-ey effect.
thank your for the help with this
I used to work with moving textures such as water or lava, and there is a youtube video about how moving textures work with lava or water, and especially some sort of tutorial with decals and texture on the Developer Hub.
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