the virtual texturing is turned on , gives error and doesnt allow loading of more than 1 tile ,the texture was tested in 5.5.4 where it worked just fine
Is virtual texture setting turned on in project setting? if no enable it, if yes then open the texture(s) if more than 1 udim use property matrix to batch edit texture setting then enable virtual streaming, hope that helped.
as it says in the first sentence the virtual texturing is turned on in project settings , and on the texture importing the setting for virtual streaming is on , the texture shows up as a 4 udim texture in the viewport but when applied to shader only the first tile loads on the model ,and it shows the warning in the viewport of the tex preview its not something that is not ticked on this is something wrong with the engine not loading the udims in 5.6 as ive said in 5.5.4 with proper settings every udim loaded properly