Is there a way to access the phone filesystem from computer, wireless? Known solutions:

USB Mass Storage (sadly, mostly deprecated on Android 4, 5, etc.).

MTP, and I know its benefits (a lot) and its weaknesses (browsing on a MTP drive with Windows Explorer has poor integration of usual features: try to right click on a file on a MTP drive, you don't have the usual UI things like Open with etc.)

Samba

FTP server solutions (good solution, but 1) how to use this if I'm on the road, with no Wifi router like at home? then I cannot link computer &lt;---&gt; phone?  2) it seems that such an app doesn't offer access to external sd card)

AirDroid, etc.


But with all these methods, you don't really have access on your computer to the phone's filesystem like if it was a local folder.
Question:
Is there a solution that makes it possible to browse the phone's filesystem as if it was a computer local folder, easily?
According to the mentioned requirements, more powerful tool to use is Sambadroid. SambaDroid is a native port for Android of the popular Samba for Linux. This application allows you to share/manage files on your device easily from any device of your network.
Update: With the Windows Creators Update you may (or not) need to first enable SMB Server/Client functionality.
Pros

No need to use router even a mobile hotpot works fine
You can easily set a share from your android device (e.g sd card)
Ability to set shared folder with read/write permissions

Limitations

Due to limitations in later editions of Windows trying to explicitly map the network drive can result in a &quot;network not found&quot; error. Ignore it and use Windows explorer method.

Requires root (needed for CIFS implementation on android). Alternatively if not root, then its better to create a shared folder on windows then access it from android with a suitable file explorer, you can still perform file operations.


Setup involves setting the desired share from the device. See screenshot:

Note: NO affiliation with the above aplication
Switch on your mobile hotspot and allow your PC to connect to the network.
Once done just type [Win]+[R] in your computer, write \\SAMBADROID
or go to PC &gt;&gt; Network and you will see a new share, see below:


The samba share will look like this:


You can perform various functions like delete, copy etc. See below:

Hope this helps.