TYPO3 Core

 <image>
    <TCEforms>
        <label>Select Image</label>
        <config>
            <type>group</type>
            <internal_type>db</internal_type>
            <appearance>
                <elementBrowserType>file</elementBrowserType>
                <elementBrowserAllowed>jpg,jpeg,png,svg</elementBrowserAllowed>
            </appearance>
            <allowed>sys_file</allowed>
            <size>1</size>
            <minitems>1</minitems>
            <maxitems>1</maxitems>
            <show_thumbs>1</show_thumbs>
        </config>
    </TCEforms>
</image>

The above configuration is working until TYPO3 v11, but in TYPO3 v12 it's not worked and is used in my many extensions with FlexForm <section> plugin options.

In my above screenshot, I didn't see files like before.