Issues using HTTP file download Smart service

Question

Hello friend, 
 I use the HTTP file download smart service to download files to the Appian folder from an endpoint. Now the problem is the files downloaded to Appian folder are not seen to have any extension (.pdf, .doc) sometimes. With no extension, the files aren't recognized by Appian and they're not found in related process models that try to retrieve them. Any one has a clue what is going wrong here? 
 
 Thanks, 
 Nick

aloks0189 · Accepted Answer

Hi tongyangn0002 few things here to consider: 
 
1. In case of file download: I believe you are trying to download the file from a third party system, hence first of all you need to communicate with them, whether the file is Corrupted or without its extension at their end, because we have face these issues with SharePoint several times, if so then nothing to do from Appian end, in fact the service provider must update their service. Also are you facing this issues with each and every document download? If not, that means all god from your end. Also can you please specify list of formats which gets corrupted/ didn't transfer properly in your case. 
 
2. Document upload: When you upload a file from Appian KC to third party system using this OOTB smart service, you have to define the extension of the file which you can retrieve using document() , and append it with filename(.) extension, if you don't do so, this file will be transferred without its extension to the target system.

paragk998 · Answer

use file name with extension 
="testDoc"&".pdf" 
or ="testDoc"&".doc" 
 
you will get the uploaded file with given extension

aloks0189 · Answer

Hi Pradeep 
 Seems like, the are some confusion over this discussion thread, integration object and http file download smart service is meant for two different purposes. 
 Integration object is meant for: Invoking a service and can exchange the data in form of text ( json, XML etc..) only, which means, we don't have the opportunity to exchange the binary content such as document. Also this can be used to perform authentication operation and return the response of a service. 
 Whereas Http file download smart service is meant for: downloading a file from an external system into Appian using binary stream. 
 Also, out if interest, seems like it's a very old discussion thread re-initiated once again :) 
 Hope this helps.