Gateway Not configured Correctly. File cannot be added to the dataset

Hi tom. Thanks. 

One question, where is the gateway installed? [JP] It is installed in a windows server

I assume you installed the gateway using the enterprise mode, meaning not the personal mode. [jp] Yes, enterprise

When the gateway is installed there is a service account, you have to make sure that the service account use is able to access the csv files. I recommend to use a managed service account. [Jp]The service account is the email that I register in the gateway? Or is the service account the user that is configured in the "Gateway Service account". I register the gateway with my powerbi account email and the "Gateway service account" with a local admin user of the server. I also checked this user is able to access the files:

On the other hand:

I am developing a number of apps based on many csv files that are changing every day in the server. Many apps will use the same csv file sometimes. In that case is better to put the files in a one drive for business and avoid using the gateway? If that is better then this change everything.

Thanks a lot and happy new year!

Regards

Juan Pablo