I've been trying to replace the image from Odoo Website sliders that are accessed through localhost:8069/slides. But it won't still displayed. Did I missed some import?

I inherited the website_slides.courses_home template with class s_banner and tried to change the background-image with my own svg but the background is just a black after I replaced it using XPath. Any idea? Thanks in advance

Log: 2023-09-20 00:19:52,247 21098 INFO o14-custom_db werkzeug: 127.0.0.1 - - [20/Sep/2023 00:19:52] "GET /custom_addons/custom_module/static/src/img/banner_dupli.svg HTTP/1.1" 404 - 231 0.095 0.542