Do you want to request a feature or report a bug?

Maybe a bug

What is the current behavior?

CreateBlipFill doesn't work in plugin or macro for slides.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem.

This kind of macro doesn't work (no effet).

(function()
{
 oPresentation = Api.GetPresentation();
 oSlide = oPresentation.GetSlideByIndex(0);
 oFill = Api.CreateBlipFill("https://api.onlyoffice.com/content/img/docbuilder/examples/icon_DocumentEditors.png", "tile");
 oSlide.SetBackground(oFill);
})();

No more luck with the builder example here in preview mode, but the final document seems good if you generate the document with this link

What is the expected behavior?

Fill the slide background with an image.

Which versions of DesktopEditors, and which OS are affected by this issue? Did this work in previous versions of DesktopEditors?

ONLYOFFICE Desktop Editors version 6.2.0.148
Ubuntu 20.04