Cinema 4D delete button from palette

Menue-> Selection -> Selection-Filter you can find the „Selection“-Object. There you can save any selection you like .. from tags to objects

I have no idea why or any better solution until now, but if you are experiencing that your materials are only white in the octane liveviewer you can try to change the projection-style of your material from (standard) uvw-mapping to spherical mapping (or any other type) in the c4d attribute window. Looks like this is…

Under the Layout-field you find the Texcel-Density of your islands. Pick the island, press pick, get the number. Open another asset, pick your island/s and enter the same number. press set. Now you have the same Texcel-Density over your different assets. Awesome tool !

Sometimes your brush oder eraser paints over UV parts that you don´t want to paint … change Aligment in the brush-tool from Tangent to UV to fix the error

Export UV Map as png, jpg, bmp, .. go to „Files – Export UV“ for Photoshop or any other programm with UDIM Tiles.