After clicking on the apps option next step is to click here WhatsApp 

Now something like this will come in front of you Meaning you will come to the app info of WhatsApp

Now next you have to click on the top of the force stop click OK

Now you have to click on the option of mobile data

Next step you have to click on Allow Background data usage & You have to turn off Allow app while Data Saver on 

Now click on view app settings

Now here you have to come down a bit Bottom of the screen Now click on photo upload quality

& Click here for the mobile connection option

After clicking now you see a mobile network option easy to click these option

now what do you have to do next , Now click on the Access Point Name

Now click on the 3dot in the corner & click here to reset to default option

& Reset Apn Setting means click on the Reset option

Now click on 1st Internet Settings

Now turn on internet data & option open your whatsapp & now easy upload your any status 

The problem is solving ,you can solve this problem like this