javascript - automated file upload selenium ide 2.8 on mac -

i experiencing problem executing automated uploading of file onto website.

i'm using selenium ide version 2.8 via firefox 31 on mac test process of web system through browser in work. @ 1 point of process requires me upload excel file.

i have searched many forums , blogs solution work on macos x firefox selenium ide none helped.

in script, have:

command : click

target : name=...

value :

this line click on button have text word 'select file' , 'file upload' dialog window pop out me select file want download

command : type target : driver.findelement(by.id("file upload")) value : /users/...../excel.xlsx

this line supposed find element id path in 'file upload' , select path of file stated me in value column.

problem occured: [error] element driver.findelement(by.id("file upload")) not found

as far understand, im not sure if correct read , understand, works others wont work me. missing something?

for part:

command : type target : driver.findelement(by.id("file upload")) value : /users/...../excel.xlsx

can change target id=file upload ?