I could not make a screenshot on my android phone. Tried what found on Google (press power and volume at the same time), but it just turned off my phone so I needed to get the picture from the history
Do you have a wake button? On iphone it's power and the round wake button at bottom of screen. (I often switch stupid phone off instead of taking a screenie)
either way not sure what make you do have but found this... maybe one of the other ways to do it might work.
Acer phones
Hold down the power and volume-down buttons for a couple of seconds.
Pull down the notification panel to reach quick settings and tap the Screenshot icon.
Asus phones
Hold down the power and volume-down buttons for a couple of seconds.
Pull down the notification panel to reach quick settings and tap the Screenshot icon.
HTC phones
HTC U series: Hold down the power and volume-down buttons for a couple of seconds.
HTC 10: Hold down the home and volume-down buttons OR hold down the power and volume-down buttons for a couple of seconds.
All other HTC phones: Hold down power and volume-down buttons for a couple of seconds.
Huawei and Honor phones
Hold down the power and volume-down buttons for a couple of seconds.
Pull down the notification panel, switch to Shortcuts, and tap the Screenshot icon.
Lenovo
Hold down the power and volume-down buttons for a couple of seconds.
Pull down the notification panel and tap the Screen Shot icon.
LG phones
Hold down the power (located on the back of the phone) and the volume-down buttons for a couple of seconds.
Pull down the notification panel and tap the Capture+ icon.
Motorola phones
Hold down the power and volume-down buttons for a couple of seconds.
Nexus and Pixel phones
Hold down the power and volume-down buttons for a couple of seconds.
Samsung phones
Galaxy S8: Hold down the power and volume-down buttons for a couple of seconds.
Galaxy S7 and earlier: Hold down the home and volume-down buttons for a couple of seconds.
Sony phones
Hold down the power and volume-down buttons for a couple of seconds.
Hold down the power key until a screen appears and tap Take screenshot.
ZTE phones WTF is this phone when it's at home
Hold down the power and volume-down buttons for a couple of seconds.