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How can i Upload image in admin form using data interface and repository?

I want to upload image in admin form by using my DataInterfaceFactory and DataRepositoryInterface Classes, i have create and my interfaces and and form in admin dashboard but don’t know how i apply save functionality?
This is my ui component form and what is next step after this, how to save data using Data Interfaces and Repository approache?

<?xml version=”1.0″?>
<form xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:noNamespaceSchemaLocation=”urn:magento:module:Magento_Ui:etc/ui_configuration.xsd”>
<argument name=”data” xsi:type=”array”>
<item name=”js_config” xsi:type=”array”>
<item name=”provider” xsi:type=”string”>promotions_form.promotions_form_data_source</item>
</item>
<item name=”label” xsi:type=”string” translate=”true”>Upload Images</item>
<item name=”reverseMetadataMerge” xsi:type=”boolean”>true</item>
<item name=”template” xsi:type=”string”>templates/form/collapsible</item>
<item name=”config” xsi:type=”array”>
<item name=”dataScope” xsi:type=”string”>data</item>
<item name=”namespace” xsi:type=”string”>promotions_form</item>
</item>
</argument>
<settings>
<buttons>
<button name=”save” class=”RLTSquarePromotionsPopUpBoxBlockAdminhtmlFormEditSaveButton”/>
<button name=”reset” class=”MagentoCustomerBlockAdminhtmlEditResetButton”/>
<button name=”back” class=”MagentoCustomerBlockAdminhtmlEditBackButton”/>
</buttons>
<deps>
<dep>promotions_form.promotions_form_data_source</dep>
</deps>
</settings>
<dataSource name=”promotions_form_data_source”>
<argument name=”dataProvider” xsi:type=”configurableObject”>
<argument name=”class” xsi:type=”string”>RLTSquarePromotionsPopUpBoxUiComponentDataProvider</argument>
<argument name=”name” xsi:type=”string”>promotions_form_data_source</argument>
<argument name=”primaryFieldName” xsi:type=”string”>entity_id</argument>
<argument name=”requestFieldName” xsi:type=”string”>id</argument>
<argument name=”data” xsi:type=”array”>
<item name=”config” xsi:type=”array”>
<item name=”submit_url” xsi:type=”url” path=”promotions/form/save/”/>
</item>
</argument>
</argument>
<argument name=”data” xsi:type=”array”>
<item name=”js_config” xsi:type=”array”>
<item name=”component” xsi:type=”string”>Magento_Ui/js/form/provider</item>
</item>
</argument>
</dataSource>
<fieldset name=”promotions_popup_box”>
<settings>
<label translate=”true”>Upload Images</label>
</settings>
<field name=”title”>
<argument name=”data” xsi:type=”array”>
<item name=”config” xsi:type=”array”>
<item name=”dataType” xsi:type=”string”>text</item>
<item name=”label” xsi:type=”string” translate=”true”>Title</item>
<item name=”formElement” xsi:type=”string”>input</item>
<item name=”dataScope” xsi:type=”string”>title</item>
</item>
</argument>
</field>
<field name=”image” formElement=”imageUploader”>
<settings>
<label translate=”true”>Images</label>
<componentType>imageUploader</componentType>
<validation>
<rule name=”required-entry” xsi:type=”boolean”>false</rule>
</validation>
</settings>
<formElements>
<imageUploader>
<settings>
<allowedExtensions>jpg jpeg png</allowedExtensions>
<maxFileSize>25097152</maxFileSize>
<uploaderConfig>
<param xsi:type=”string” name=”url”>imageuploader/images/tempUpload</param>
</uploaderConfig>
</settings>
</imageUploader>
</formElements>
</field>
<field name=”category_link”>
<argument name=”data” xsi:type=”array”>
<item name=”config” xsi:type=”array”>
<item name=”dataType” xsi:type=”string”>text</item>
<item name=”label” xsi:type=”string” translate=”true”>Category Link</item>
<item name=”formElement” xsi:type=”string”>input</item>
<item name=”dataScope” xsi:type=”string”>category_link</item>
</item>
</argument>
</field>
<field name=”timer” formElement=”date”>
<argument name=”data” xsi:type=”array”>
<item name=”config” xsi:type=”array”>
<item name=”source” xsi:type=”string”>timer</item>
</item>
</argument>
<settings>
<validation>
<rule name=”validate-date” xsi:type=”boolean”>true</rule>
</validation>
<dataType>text</dataType>
<label translate=”true”>Timer</label>
<visible>true</visible>
<dataScope>timer</dataScope>
</settings>
</field>
</fieldset>
</form>

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