my lg and my facebook question

Help... I have a LG V20...  I have a facebook and when I go to post a message on my timeline... I go to my photos to add a photo from my gallery and it will not sinc with my gallery.. It says I have no photos in my gallery.  yet I go to my gallery on my phone and they are all there.. So my facebook is not sincing with my gallery on my phone... it worked for  the last couple years and now not... what should all my settings be on to make them sinc... I don't get it.. having trouble... not happy now.. Please Help./...

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