android-nrf-toolbox dfu can't load zip file

[gaetano]

I've tried to upgrade the firmware using the DFU feature of the android nrf-toolbox app, but it returns the "REading file failed" error.

this happens only with my phone Samsung Galaxy S6 Edge (android 6.0.1). Using other phones / tablet, it works fine (Galaxy S3, Galaxy Tab4, Moto G 2nd gen.).

I has the same error when loading the file with nRF Connect android app.

EDIT

I've found that the problem was the file manager (used to select the zip file) installed on my phone. I've installed a different file manager and it works fine.

[bjorn-spockeli]

Issue caused by the file manager, that is used to select the zip file installed on the phone. Installing a different file manager resolves the issue and DFU can be performed.

[gaetano]

the file manager is "Explorer" (play.google.com/.../details it simply doens't return the filename of the selected file. I really don't now why...