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docs/zagros/uploader/uploader.md

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+# Uploader
+
+The uploader **principle** defines that who is responsible for saving any document type in the system and how does it.
+
+the Opendax support these providers as uploader type
+`local` `google` `aws` `alicloud`
+
+for `google`, `aws`, and `local` type, the UploadUploader class is a provider, 
+this class is a child from this gem :
+[carrierwave](https://github.com/carrierwaveuploader/carrierwave)
+
+**path of file** : app/uploaders/upload_uploader.rb
+
+but for `alicloud` type, the provider is `AliUploader` class
+
+**path of file** : app/uploaders/ali_uploader.rb that this class in the child of carrierwave gem too.
+
+
+in the `Dalan` version, we save files without any encryption
+and use only `local` type for uploader and this config exist in alvand/config/app.yml  
+
+the path of uploaded file is :
+
+```"public/uploads/#{model.class.to_s.underscore}/upload/#{model.id}"
+example : public/uploads/document/upload/1/front_card.png
+```
+###TODO
+#### [Fog](https://fog.io/storage/)
+in app/uploaders/upload_uploader.rb , we change the config code to hardcode to always use `local` type,
+if you want to use fog type you must revert these lines:
+line 4 to 12