Hi, my friend.
You can configure ALG in the following ways:
1. In the navigation tree on the left, choose Network Applications > ALG Configuration. In the pane on the right, determine whether to enable the FTP or TFTP, as shown in the following figure:

2. Click Apply to apply the configuration.
NOTE:
When the NAT function is enabled, the application-level gateway (ALG) function needs to be enabled to ensure that some application software and hardware can be normally used.
For more information about the EG8280P device, click:
Huawei EchoLife EG8280P - an informative product review
Thanks.