SIGNL4 supports attachments when sending alerts. You can attach image (jpg) and sound (mp3) files to your alerts.
Attachments must not exceed the size of 4 MB.
Simply attach those files to your emails or make them part of your webhook call via multipart/formdata. See more here: https://account.signl4.com/manage/Apps/Webhook
SIGNL4 alerts can also be enriched with GPS locations and alert texts can be overridden through category settings.
Since the newly released version it is now possible to attach Videos (up to 4 MB) to mail and webhooks (supported formats: .mov and .mp4)
Also please check: