Welcome @Janeth_Ramirez
I can see both ends of a single pair in your history but it looks like these have not been organized into a collection folder yet.
How to organize the data is included in this tutorial (and many others, usually at the top in the data organization steps).
- Hands-on: Using dataset collections / Using dataset collections / Using Galaxy and Managing your Data
- In the history, use Select Datasets on the left side of that panel, check/uncheck the datasets you want to combine, then choose Build List of Dataset Pairs on the right. A pop-up will open where you can name the folder. Then go back to the tool form and it will recognize the collection folder if the format datatype of the data inside a folder is a fit for the tool (you can also just drag it on top of the input area).
- If you use default options when building the collection, the original datasets will be marked to sort into the Hidden tab of the history, simplyfing the Active tab view. You can unhide these whenever you want to, or not hide them when building the collection.
- Try doing this and let us know if you get stuck and we can go over it closer. Screenshots might help.
Some tools will allow you to select individual datasets to form a pair, and others like this one expect the data to already be in a collection folder (this keeps track of samples to avoid mixups). Later on, workflows will be the same way, with an expected input, usually a collection. With one sample all is about the same, but with several hundred (or thousand!), the collections are much easier to work with.
Next time, you can set up the collection at very start (after Upload), run though the QA steps, then use downstream tools all with the data organized.
This topic is another good reference and includes a workflow you can use (or modify) for these early QA steps. All the data is processed in a “collection” folder format, and you can see the different types of collection folders and how those are transformed from one into another in the hidden datasets/steps. All was done with the Collection Operations tools that first tutorial above is explaining.
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Example output of the workflow included there (you can just navigate around in the History preview to see the “nested” formats, no need to import it, but of the Workflow might be helpful for later):
Hope this solves the trouble, but please let us know if you need more help! 