the email which has came but couldn't download and say that file is not supportive

[AC Question]

Others email download easily but at my android the file open at gmail when it is connected with WiFi ...but couldn't download ..if I try to open from the email site then the attachment file didn't open and say there is no installed app to open file. I installed many apps but didn't work.so which app may work easily to open the file of the email and download

 

[gyanu]

Please tell me the app which helps to download the gmail or email message

 

[gyanu]

Please tell me the app which help to open gmail or emails messages