Cannot import frames or texture strips into animated textures

When creating an animated texture, there are 4 options to import frames; Add a singular frame, add a template, add a texture strip and add a GIF. However, only the template works for me, the rest are non-functional. Pressing the "Add Frame" button does nothing, same for the GIF button, the texture strip brings up a GUI however the "browse" button doesn't do anything either. I edited a vanilla portal texture strip and would like to use that instead of a template, would anyone know the fix to this bug? Thanks