Cura doesn't seem to recognized my merged file?

[dij0nmustard 0]

Hi, first time poster here. I have a miniature that I'd like to print with an ultimaker 3+ - just a generic adventurer with a wicker basket slapped onto his face (pulled from thingiverse). However, whatever I do to merge the models, Cura just ignores for some reason. I've tried Fusion 360 and MeshMixer's combine feature and so far, I've only been able to get the character printed without the wicker basket mask. Are there any suggestions as to what I should try next?

I will mention that I'm pretty new to printing minis, but so far they've come out alright. I like using Cura's tree supports because they're pretty easy to pull off. I used meshmixer's supports but I couldn't pull them off without ripping off the arms. If meshmixer is a must, then is there a good setting for the supports?

Thanks in advance!

[ahoeben 1,850]

Unless you did a proper join / unioned / boolean operation in the application you used to merge the two models, the models are actually still separate and overlapping. Overlapping models confuse slicers. It is also possible that the basket is hollow and simply too thin to print.