Ghost/ghost/admin/lib/koenig-editor/addon/templates/components/koenig-card-image.hbs

{{#koenig-card
    tagName="figure"
    class=(concat (kg-style "media-card") " flex flex-column")
    isSelected=isSelected
    isEditing=isEditing
    selectCard=(action selectCard)
    onSelect=(action "onSelect")
    onDeselect=(action "onDeselect")
    editCard=(action editCard)
    toolbar=toolbar
    hasEditMode=false
}}
    {{#gh-uploader
        accept=imageMimeTypes
        extensions=imageExtensions
        onStart=(action "setPreviewSrc")
        onComplete=(action "updateSrc")
        onFailed=(action "resetSrcs")
        as |uploader|
    }}
        <div class="relative">
            {{#if (or previewSrc payload.src)}}
                <img src={{or previewSrc payload.src}} class="{{kg-style kgImgStyle sidebar=ui.hasSideNav}}" alt={{payload.alt}}>
            {{/if}}

            {{#if (or uploader.errors uploader.isUploading (not payload.src))}}
                <div class="relative miw-100 flex items-center {{if (not previewSrc payload.src) "kg-media-placeholder ba b--whitegrey" "absolute absolute--fill bg-white-50"}}">
                    {{#if uploader.errors}}
                        <span class="db absolute top-0 right-0 left-0 pl2 pr2 bg-red white sans-serif f7">
                            {{uploader.errors.firstObject.message}}
                        </span>
                    {{/if}}

                    {{#if uploader.isUploading}}
                        {{uploader.progressBar}}
                    {{else if (not previewSrc payload.src)}}
                        <button class="db center btn-base ba b--whitegrey br3 sans-serif fw4 f7 middarkgrey" onclick={{action "triggerFileDialog"}}>
                            <span>Click to select an image</span>
                        </button>
                    {{/if}}
                </div>
            {{/if}}
        </div>

        <div style="display:none">
            {{gh-file-input multiple=false action=uploader.setFiles accept=imageMimeTypes}}
        </div>
    {{/gh-uploader}}

    {{#if (or isSelected payload.caption)}}
        <figcaption class="{{kg-style "figcaption"}} w-100">
            <input
                value={{payload.caption}}
                type="text"
                class="miw-100 tc bn form-text"
                name="caption"
                oninput={{action "updateCaption" value="target.value"}}
                placeholder="Type caption for image (optional)">
        </figcaption>
    {{/if}}
{{/koenig-card}}