Cannot Upload Product Image at Vendor Account

-- HikaShop version -- : 3.0.0
-- HikaMarket version -- : 1.7.3
-- Joomla version -- : 3.6.6
-- PHP version -- : 5.6.38
-- Browser(s) name and version -- : Google Chrome

hi,

I cannot upload the product image at the frontend by using vendor account access

sometimes can, sometimes cannot. after I delete one of the image and want to upload another image also cannot

I had try to drag the image for upload also cannot work

please assist on me, thanks