Hi May know how my system get captured image/snapshot (JPG or PNG) or videos from milestone based on time of alert triggered(e.g. thermal detection) and time of licence plate recognized, Thanks

You can make a snapshot in Smart Client. Please find following icon in Smart Client, when you click this icon then you can get a snap shot.

CreateSnapshotIf you want to develop an integration application or service with this functionality, you can develop an app that retrieve the recorded image at time of alarm or event.

Ok, but any method to get the snapshot by coding based on time of alert triggered(e.g. thermal detection) and time of licence plate recognized?

Please see this link, this might be helpful -

https://doc.developer.milestonesys.com/html/index.html?base=miphelp/class_video_o_s_1_1_platform_1_1_data_1_1_j_p_e_g_video_source.html&tree=tree_search.html?search=jpegvideosource