> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Documents tab in Document Splitter skills
> Manage documents in a Document Splitter skill — upload, organize into sets, label, and configure documents for training and testing.
The **Documents** tab lists every document a Document Splitter skill uses for setup, training, and testing. From here you can upload files, organize them into sets, label them, and run tests against specific subsets.
## Document sets
Documents are organized into **document sets**. Every skill has an **All Documents** set (created automatically) that contains every uploaded document. You can also create custom sets — each is a subset of **All Documents**, and a single document can belong to multiple custom sets.
When you create a new activity, it uses **All Documents** by default. Custom sets are useful when one skill applies different rules to different document variants — see the [Classify By Text and Image activity](/vantage/documentation/advanced-designer/activities/classify-by-text-and-image).
The **Documents** tab title reflects the current selection: it reads **All Documents** for the default set, or `Documents: ` for a custom set.
### Create a custom document set
On the skill, switch to the **Documents** tab.
Click the add button in the list of document sets.
Provide a name for the custom set.
Add the documents you want the set to contain. The new set appears alongside **All Documents** and can be edited at any time.
## Test sets
You can also create a custom set strictly for testing — for example, a balanced set of documents from a specific client. A test set isn't linked to any activity.
### Create a test set
On the **Documents** tab, click the add button in the list of document sets. If the documents you want are already uploaded, select them and choose **Create Set from Selection** on the shortcut menu.
Provide a name that identifies the set's purpose.
Select the set, then choose **Test Skill Using This Set** on the shortcut menu.
To test against an ad-hoc selection instead, choose **Test Skill** on the shortcut menu of one or more selected documents.
When editing a skill that was created in Vantage, that skill's document set also appears here.
## Document processing
You can upload documents at any point. Any new upload is processed immediately by the current flow on the [Activities](/vantage/documentation/advanced-designer/document-splitter/splitter-activities) tab. After processing, the predicted labeling appears on the **Fields** tab, and reference labeling is generated automatically from it.
Reference labeling generated this way is **unconfirmed** until you copy predicted labeling to reference (shortcut menu on the document). Documents with unconfirmed labeling cannot be used for training and are excluded from test results. To confirm labeling, review the document on the **Fields** tab.
## View options
* **List view** — shows documents as a list with upload date, the sets each document is in, and a **Reference Fields** column showing whether the document is labeled.
* **Thumbnail view** — shows documents as thumbnails. Use the preview button for the full image; rotate from the more menu.
## Toolbar commands
| Command | What it does |
| :--------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Upload** | Upload documents to the selected set. Each upload is also added to **All Documents**. You can also drag files in from File Explorer. |
| **Import Labeled Documents From Folder** (in the **Upload** drop-down) | Upload pre-labeled documents to **All Documents**. The source folder can come from a skill's training set, manually reviewed transactions, or ABBYY FlexiCapture. For details, see [Importing labeled documents from a folder](/vantage/documentation/advanced-designer/labeling/labeling). |
| **Divide Set** | Split one set into two by ratio — for example, to create separate training and testing collections. |
| **Add from Set** | Add to the current set every document from another set that isn't already in the current set. |
| **Add to Set** | Add the selected documents to a different set. Disabled when the skill has only one set. |
| **Delete** | Delete the selected documents from the current set, or from every set. From within **All Documents**, deletion always removes from every set. |
| **Rotate** | Change the orientation of the selected pages: rotate 90° left, 90° right, or 180°. |
A set with fewer than 10 documents cannot be divided.
## Limits
Don't upload more than 10,000 documents to a single skill — beyond that, the skill may become unstable.
## Related topics
Build the splitter's processing flow.
Label fields and import labeled documents.
Configure General, OCR, Fields, Rules, and Parameters.