Front-end file upload incompatibility

-- HikaShop version -- : 3.5.1
-- HikaMarket version -- : 2.1.1
-- Joomla version -- : 3.8.6
-- PHP version -- : 5.6.20
-- Browser(s) name and version -- : Firefox 60.2.2 esr
-- Error-message(debug-mod must be tuned on) -- : none

File upload for vendors use opload.js from HikaShop component.
This one try to upload big files in several parts, and this works great in the back-office (with HikaShop controller/helper).

But in the front-office, the uploads are handled bu the HikaMarket controller/helper. And it seems that they are not able to manage multi-parts uploads... The first part is accepted, but the second is in error (upload_err_partial).

If I change the code in administrator/components/com_hikamarket/helpers/upload.php with the code found in administrator/components/com_hikashop/helpers/upload.php, it seems good !