Some Samsung phones ship with a document viewer; many don't, or it has been removed. Chrome alone is enough.
🔒 This file never leaves your device — nothing is sent to a server
On some Galaxy devices a document viewer is preinstalled. If tapping the file opens it, you're done. Use this page when nothing opens it, or when the text renders incorrectly.
Save the file to Downloads
Files received through KakaoTalk or email usually land in Download.
Open this page in Chrome
Tap the box above.
Pick the file
Navigate to My Files → Downloads in the picker.
The picker is probably filtering by type. Switch it to 'All files'.