pulseapi/entries/models.py [112:137]:
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    thumbnail = models.ImageField(
        max_length=2048,
        upload_to=entry_thumbnail_path,
        blank=True
    )

    def thumbnail_image_tag(self):
        if not self.thumbnail:
            return format_html('<span>No image to preview</span>')

        media_url = settings.MEDIA_URL

        if settings.USE_S3:
            media_url = 'https://{domain}/{bucket}/'.format(
                domain=settings.AWS_S3_CUSTOM_DOMAIN,
                bucket=settings.AWS_LOCATION
            )

        html = '<img src="{media_url}{src}" style="width:25%">'.format(
            media_url=media_url,
            src=self.thumbnail
        )

        return format_html(html)

    thumbnail_image_tag.short_description = 'Thumbnail preview'
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pulseapi/profiles/models/profiles.py [130:155]:
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    thumbnail = models.ImageField(
        max_length=2048,
        upload_to=entry_thumbnail_path,
        blank=True
    )

    def thumbnail_image_tag(self):
        if not self.thumbnail:
            return format_html('<span>No image to preview</span>')

        media_url = settings.MEDIA_URL

        if settings.USE_S3:
            media_url = 'https://{domain}/{bucket}/'.format(
                domain=settings.AWS_S3_CUSTOM_DOMAIN,
                bucket=settings.AWS_LOCATION
            )

        html = '<img src="{media_url}{src}" style="width:25%">'.format(
            media_url=media_url,
            src=self.thumbnail
        )

        return format_html(html)

    thumbnail_image_tag.short_description = 'Thumbnail preview'
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