There are all settings that can effect uploading of images. Look in your error_logs (if you don't know where they are, ask your host) to see if more specifics are given regarding the error:
These settings may also effect your attachments:
PHP Settings:
max_execution_time
memory_limit
post_max_size
upload_max_filesize
max_input_time
MySQL Settings:
max_allowed_packet
max_packet_size
wait_timeout
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