1

I'm running a Nexus 5 (Android 6.0.1)

Today I have created a WhatsApp backup file and wanted to copy it to a new device. I can confirm the file existence in ES File Explorer.

The backup file can be found in ES File Explorer
(Click image to enlarge)

However, I cannot find the file when I connect my Nexus 5 with a USB (MTP). But the file is missing when I connect the device to my PC

After further checking I found the file is stored in /sdcard/WhatsApp, while my PC is connecting to /Internal Storage/WhatsApp
enter image description here
(Click image to enlarge)

But I cannot find /sdcard/ in my PC...

To make things more complicated, when I reboot the N5, the file appears again /Internal Storage/WhatsApp/

I've been a long time Android user since Motorola Milestone. I'm not a dev but luckily I have the experience in tackling such issue. But for a normal user without in-depth computer knowledge, this inconsistent behavior is just weird. There's a long way for Android to catch up with iOS in terms of user friendliness.

2

/sdcard and /Internal storage are same directory.

As for why the file does not appear instantly is because of a bug in MTP mode as MTP cache is outdated until a phone reboot. If you do not wish to reboot the phone,

Possible Workaround:

  • SettingsApplication Manager → All Apps tabMedia StorageClear Data
  • Install SD Scanner app → Open App → Click on Start Rescan

Tested and Works on Android 5.0 Lollipop

2

You can Install Sarkie's MTPFix App for a permanent solution which fixes the issue.
This Automates the 2 step process mentioned in the other answer.

It monitors all the folders for new files and then adds them to MediaScanner. When Connected to a Computer, I copied a file to /sdcard from /ExternalSDCard using File Manager on phone and could see the file instantly show up on my Computer's Internal Storage listing.

Install the MTPFix App and Click on Start MTPFix Service

Source

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