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+# Attachments transformation
+
+## Transformations in General
+Transformation is a process that allows users to convert any attached file format type into a format that ODM can index.
+Currently, ODM can't accept csv files as a source of metadata, but ODM can accept tsv files for that purpose. 
+This is solved with the help of transformation.
+
+Each transformation consists of transformation script (image) and its configuration. For example, image has ability 
+to transform CSV file to TSV, at the same time configuration provides information where this TSV should be places, 
+e.g. Samples, Libraries, Preparations, Cell metadata, Expression, Variants, etc.
+
+![Diagram](../doc-odm-user-guide/doc-odm-user-guide/images/attachments-transformation-diagram.png)
+
+## Get the list of available images
+Currently ODM has default image called `metadata-basic`.
+This image allows user to transform `CSV` files into `TSV` to create Sample group.
+
+To get the list of available images via API go to `processorsController` Swagger definition of endpoints and use 
+GET `transformations/images`. Endpoint response example:
+
+```json
+[
+  {
+    "name": "metadata-basic",
+    "version": "0.0.1",
+    "description": "Basic converter from attachment to metadata",
+    "input_formats": [
+      "csv"
+    ],
+    "output_formats": [
+      "samples"
+    ]
+  },
+  {
+    "name": "metadata-basic",
+    "version": "0.0.2",
+    "description": "Basic converter from attachment to metadata",
+    "input_formats": [
+      "csv"
+    ],
+    "output_formats": [
+      "samples"
+    ]
+  },
+  {
+    "name": "metadata-basic",
+    "version": "latest",
+    "description": "Basic converter from attachment to metadata",
+    "input_formats": [
+      "csv"
+    ],
+    "output_formats": [
+      "samples"
+    ]
+  }
+]
+```
+This transformation works only in combination with configuration.
+
+## Create new configuration
+
+To create new configuration for `metadata-basic` image use POST `transformations/configurations` endpoint.
+
+Initial request body:
+
+```json
+{
+  "data": {
+    "additionalProp1": "string",
+    "additionalProp2": "string",
+    "additionalProp3": "string"
+  },
+  "description": "string",
+  "name": "string"
+}
+```
+Let’s create configuration that allows image to place transformed `CSV` file to Samples:
+
+```json
+{
+  "data": {
+    "source": "csv",
+    "destination": "samples"
+    },
+  "description": "Configuration which allows you to transform csv file into Sample group",
+  "name": "csv to samples"
+}
+```
+Response body example:
+
+```json
+[
+  {
+    "id": 294862386,
+    "name": "csv to samples",
+    "data": {
+      "destination": "samples",
+      "source": "csv"
+    },
+    "description": "Configuration which allows you to transform csv file into Sample group"
+  }
+]
+```
+
+Now configuration is created and can be found via GET `transformations/configurations` endpoint:
+
+```json
+[
+  {
+    "id": 294862386,
+    "name": "csv to samples",
+    "data": {
+      "destination": "samples",
+      "source": "csv"
+    },
+    "description": "Configuration which allows you to transform csv file into Sample group"
+  }
+]
+```
+
+## Run the transformation
+
+To proceed with transformation let’s use the following `CSV` table with Samples metadata:
+
+[Samples_metadata](https://bio-test-data.s3.us-east-1.amazonaws.com/User_guide_test_data/Attachments+transformation/samples.csv), 
+a CSV file with Sample attributes.
+
+Upload the file as attachment to your Study:
+
+![CSV-attachment](../doc-odm-user-guide/doc-odm-user-guide/images/attachments-transformation-csv.png)
+
+Go to `Transformation Jobs` section in `processorsController` group in API. Use POST `transformations/jobs` 
+endpoint to transform `CSV` file into Sample group.
+
+Initial request body:
+
+```json
+{
+  "attachment_accession": "string",
+  "configuration_id": 1,
+  "image_reference": {
+    "name": "string",
+    "version": "string"
+  },
+  "volume_size": 30
+}
+```
+Fill in information about attachment genestack accession, configuration, image name and version:
+
+```json
+{
+  "attachment_accession": "GSF016786",
+  "configuration_id": 294862386,
+  "image_reference": {
+    "name": "metadata-basic",
+    "version": "0.0.2"
+  },
+  "volume_size": 30
+}
+```
+
+Response contains information about your Job id:
+
+```json
+{
+  "$schema": "https://odm-processors-controller:8080/schemas/TransformationJobId.json",
+  "id": 341346019
+}
+```
+
+To check the status of the Job use GET `transformations/jobs/{id}` endpoint:
+
+```json
+{
+  "$schema": "https://odm-processors-controller:8080/schemas/TransformationJobFields.json",
+  "image_reference": {
+    "name": "metadata-basic",
+    "version": "0.0.2"
+  },
+  "attachment_accession": "GSF016786",
+  "configuration_id": 294862386,
+  "volume_size": 30,
+  "create_time": "2025-10-31T12:28:57Z",
+  "status": {
+    "state": "TERMINATED"
+  }
+}
+```
+
+Transformation converts `CSV` file to `TSV` format and triggers POST `jobs/import/samples/multipart` endpoint 
+automatically. It uploads new `TSV` file to Sample metadata group to the Study where initial `CSV` attachment 
+is placed.
+
+As the result new Sample metadata group was created in ODM:
+
+![Sample-group](../doc-odm-user-guide/doc-odm-user-guide/images/attachments-transformation-samples.png)
diff --git a/docs/user-guide/doc-odm-user-guide/doc-odm-user-guide/images/attachments-transformation-csv.png b/docs/user-guide/doc-odm-user-guide/doc-odm-user-guide/images/attachments-transformation-csv.png
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diff --git a/mkdocs.yml b/mkdocs.yml
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+++ b/mkdocs.yml
@@ -48,6 +48,7 @@ nav:
         - Getting a Genestack API token: user-guide/doc-odm-user-guide/getting-a-genestack-api-token.md
         - Getting Access Token (Azure): user-guide/doc-odm-user-guide/getting-access-token-azure.md
         - Supported File Formats: user-guide/doc-odm-user-guide/supported-formats.md
+        - Attachments transformation: user-guide/doc-odm-user-guide/attachment-transformation.md
     - Access Control:
         - Users: access-control/users.md
         - Permissions: access-control/permissions.md