Attachments with special characters (space, +, &, _) in the file name can´t be loaded by the Device and the CPU load on the Traveler server is higher than usual. You can see this issue in your logs:

Notes Traveler: WARNING John Doe Could not find the StreamedDataInfo: Key(80 bytes)=test_test-test.pdf@83A871B16F5E1F69EA91273D71153D60_68396, RefId=test_test-test.pdf@83A871B16F5E1F69EA91273D71153D60, DataSize=-1, Encoding=BASE64, StreamingCompleted=false, so the data was not streamed

Notes Traveler: SEVERE John Doe Action(0)=Stream, userCN=CN=John Doe/O=Acme, deviceId=CN=John Doe/O=Acme, database=mail/jdoe.nsf, server=CN=Server1/O=Acme, refid=test2 name1   name2 name3.pptx@A05B97F436189BB9C1257D5C002EA0EC, hookId=null, file_sz=-1, file_name=null, contentType=null

Notes Traveler: SEVERE John Doe Internal Error: Debug Data: Could not find file attachment w/ UNID=A05B97F436189BB9C1257D5C002EA0EC Error(404)=Entry not found in index

https://www-304.ibm.com/support/entdocview.wss?uid=swg1LO82085&myns=swglotus&mynp=OCSSYRPW&mync=R

PMR opened, Hotfix installed. View/Download now possible, but still entries in console log when attachment contains umlauts.

Notes Traveler: WARNING John Doe Could not find the StreamedDataInfo: Key(77 bytes)=sdik_Änterprise Social Netwörking .pdf@24A886F5CC724F3CC1257D5F0056EAFB_81550, RefId=Änterprise Soßial Netwörking .pdf@24A886F5CC724F3CC1257D5F0056EAFB, DataSize=-1, Encoding=BASE64, StreamingCompleted=false, so the data was not streamed  
 

Same problem with 9.0.1.3.. Lots af users have this issue

attachments not coming thru to Android clients - from our Voicemail server , which uses '_'  twice in the naming of .WAV files.

a PMR is opened and being worked thru the channels....but no resolution since Mon 4/13

attachments not coming thru to Android clients - from our Voicemail server , which uses '_'  twice in the naming of .WAV files.

a PMR is opened and being worked thru the channels....but no resolution since Mon 4/13