Filer file delete on admin site does not delete the physical file on /media/filer_public_thumbnails/ folder

[openHBP]

Connected as admin, when I delete a file on admin site, the file remains on the server...

ie: I've deleted slider2.jpg on admin site and the file remains on media/filer_public_thumbnails/filer_public/4e/c3/4ec30f72-18f1-4cc3-8cc9-b76021f65a62 with all subsampling files: ./slider2.jpg__16x16_q85_crop_subject_location-960,599_subsampling-2_upscale.jpg ./slider2.jpg__210x0_q85_subject_location-960,599_subsampling-2_upscale@2x.jpg ./slider2.jpg__64x64_q85_crop_subject_location-960,599_subsampling-2_upscale.jpg ./slider2.jpg__48x48_q85_crop_subject_location-960,599_subsampling-2_upscale.jpg ./slider2.jpg__32x32_q85_crop_subject_location-960,599_subsampling-2_upscale@2x.jpg ./slider2.jpg__48x48_q85_crop_subject_location-960,599_subsampling-2_upscale@2x.jpg ./slider2.jpg__64x64_q85_crop_subject_location-960,599_subsampling-2_upscale@2x.jpg ./slider2.jpg__210x0_q85_subject_location-960,599_subsampling-2_upscale.jpg ./slider2.jpg__32x32_q85_crop_subject_location-960,599_subsampling-2_upscale.jpg ./slider2.jpg__16x16_q85_crop_subject_location-960,599_subsampling-2_upscale@2x.jpg

Is it normal? Is it implemented?

I would have though of an automatic delete with pre post delete signals as specific django-cleanup package does for django.db.models.FileField and django.db.models.ImageField

Environment

Python==3.6.9 Django==3.0 django-cms==3.7.4 django-filer==1.7.1 django-polymorphic==2.1.2 Pillow==7.2.0 easy-thumbnails==2.7 django-mptt==0.11.0

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