Why the tool doesn’t recognize the bam dataset, it puts me that it’s unavailable
Welcome, @Ricardo_Chinchilla
Things to check
- Does dataset you want to use have the bam datatype assigned? The tool form lists out the expected datatype of the inputs under “Accepted formats”. When those “match” datasets in the history, those data become available as an input for that field.
- If the data are inside a collection folder, click on the folder icon so the select field is looking for the correct data shape.
Select an individual dataset
Select a collection folder of datasets
Please give that a review and let us know if it helps. 
You are welcome to share some screenshots if you need more help. Try to capture the tool form and your data in the history with all of the metadata shown (expanded datasets).
Welcome, @yoyo
Double check that the history in the screenshot is the currently active history.
You can do that a few ways
- Click on the top left Galaxy icon
- Refresh your browser window
- Go to Data → Histories and review
- Go to User → Preferences, turn on the Activity Bar, and find the Histories button in your new left panel
Hope this helps!