This spiderhunter looks very much like the Streaked Spiderhunter (Arachnothera magna) that I found at Fraser’s Hill. You can find the streaked at Montana forest, but the Grey-breasted at low land like Kuala Tahan. So the different species between magna and modesta
EDIT: this is Sunbird NOT spiderhunter!
Purple-naped Sunbird (Hypogramma hypogrammicum) – ID by Smathi Chong. Thank you!
Local name: Kelicap Rimba