zulip/static/templates/compose_control_buttons.hbs

<input type="file" class="file_input notvisible pull-left" multiple />
{{#if file_upload_enabled }}
<a role="button" class="compose_control_button compose_upload_file fa fa-paperclip notdisplayed" aria-label="{{t 'Upload files' }}" tabindex=0 data-tippy-content="{{t 'Upload files' }}"></a>
{{/if}}
<a role="button" class="markdown_preview compose_control_button fa fa-eye" aria-label="{{t 'Preview' }}" tabindex=0 data-tippy-content="{{t 'Preview' }}"></a>
<a role="button" class="undo_markdown_preview compose_control_button fa fa-edit" aria-label="{{t 'Write' }}" tabindex=0 style="display:none;" data-tippy-content="{{t 'Write' }}"></a>
<a role="button" class="compose_control_button fa fa-video-camera video_link" aria-label="{{t 'Add video call' }}" tabindex=0 data-tippy-content="{{t 'Add video call' }}"></a>
<a role="button" class="compose_control_button fa fa-smile-o emoji_map" aria-label="{{t 'Add emoji' }}" tabindex=0 data-tippy-content="{{t 'Add emoji' }}"></a>
<a role="button" class="compose_control_button compose_giphy_link {{#unless giphy_enabled }} hide {{/unless}}" aria-label="{{t 'Add GIF' }}" data-tippy-content="{{t 'Add GIF' }}">
    <i class="compose_gif_icon zulip-icon zulip-icon-gif" tabindex=0></i>
</a>
{{#unless hide_drafts_link}}
<a class="message-control-link drafts-link" href="#drafts" title="{{t 'Drafts' }} (d)">{{t 'Drafts' }}</a>
{{/unless}}
<a role="button" class="message-control-link" tabindex=0 data-overlay-trigger="message-formatting">{{t 'Help' }}</a>