Hi! I’m a bit late but I found a solution! since this one doesn’t work for me… You need to create a material parameter collection, under material & texture. Then in it, you can create ‘‘scalar parameters’’ and ''vector parameters.
In your material, you can then go search what you just created in the ‘‘palette’’, look for ‘‘parameters’’, then ‘‘Collection Parameters’’, you can connect it where you want. (i suggest in a multiplier or an alpha channel)
After you need to specify the collection and the parameters name. You can then go search the parameter’s value in your blueprint in a node called: “set scalar (or vector) parameter value” and you can access the same material parameter collection you just create and change in your blueprint by changing the ‘‘parameter value’’!
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