hello @TalessRocha 

In Free Edition dbfs is disabled. You should use Unity Catalog for that purpose anyway. DBFS is depracated pattern of interacting with storage.

So, to use volume perform following steps:

Go to Catalgos (1) -> Click workspace catalog (2) -> Click default schema -> Clikc Create button (3)

On the Create button (3) you will have an option to create volume. Pick a name and then create volume.

reference : szymon_dybczak

If you did that, your new volume should appear in Unity Catalog under default schema. Now you will have an option to upload file to Volume:

And here's an example of how to read csv from volume into dataframe: