while saving admin cms pages getting 404 not found page

in magento 2

already permission for

pub/media 777
var  777

how i can solve this

i'm using magento 2.1.11

Edit1:

I created new cms page when i add text and i saved that it's working

 

if i add any files(image) then i save that i'm getting 404 page error not found

pub/media permissions

while saving admin cms pages getting 404 not found page

in magento 2

already permission for

pub/media 777
var  777

how i can solve this

i'm using magento 2.1.11

Edit1:

I created new cms page when i add text and i saved that it's working

if i add any files(image) then i save that i'm getting 404 page error not found

pub/media permissions

while saving admin cms pages getting 404 not found page

in magento 2

already permission for

pub/media 777
var  777

how i can solve this

i'm using magento 2.1.11

Edit1:

I created new cms page when i add text and i saved that it's working

if i add any files(image) then i save that i'm getting 404 page error not found

while saving admin cms pages getting 404 not found page

in magento 2

already permission for

pub/media 777
var  777

how i can solve this

i'm using magento 2.1.11

Edit1:

I created new cms page when i add text and i saved that it's working

if i add any files(image) then i save that i'm getting 404 page error not found

pub/media permissions

while saving admin cms pages getting 404 not found

in magento 2

already permission for

pub/media 777
var  777

how i can solve this

i'm using magento 2.1.11

while saving admin cms pages getting 404 not found page

in magento 2

already permission for

pub/media 777
var  777

how i can solve this

i'm using magento 2.1.11

Edit1:

I created new cms page when i add text and i saved that it's working

if i add any files(image) then i save that i'm getting 404 page error not found