first post here...

So I'm attempting to utilize a custom shutdown animation on my LG K7 that I use for dev purposes..

Ive made backups of the original shutdownanimation.zip, and using custom pictures (same .png format, resolution,color depth, etc) I've replaced the original picture files within the zip with the new ones.  

Shutdown only displays a black screen.

So I push backup back to phone, displays LG logo again.

Deciding to experiment, I took my stock bootanimation.zip, renamed it to shutdownanimation.zip and overwrote the shutdownanimation.zip on my phone.  

As expected, this gave me the stock boot up animation during shut down.

So I decided I would take a copy of the original shutdownanimation.zip file, and simply edit the existing pictures within it using an image editor.  I just opened each of the two original picture files within the zip and used a drawing tool to write 'custom' over the lg logo, then overwrote the new picture files back into shutdowanimation.zip and pushed to phone.

I though for sure I would see the altered LG logo, but instead I got a black screen.  

Any ideas?