Hello!
1st) the texture parameter act as a placeholder for your widget, in short it is replaced by your widget.
2nd) the mask … Ok is a mask
That said… Add a texcoord inside your material, drag from it and add a texture sample called placeholder and put in it a texture, don’t worry what texture, it will be replaced.
From the sample drag to final color(material)
now … In your widget , inside texture parameter type placeholder (case sensitive!)
from texcoord drag also to mask(change it to texture sample) and drag it in opacity.
Let me know!