Inputs are not permitted on the Search Tier of Splunk Cloud. When installed on the Search Tier any inputs.conf settings within the App or TA will be stripped from it. That said you can either also install the TA onto a On Prem hosted Forwarder / Heavy Forwarder or it can be installed onto an Inputs Data Manager (IDM). Most newer instances should have an IDM built with it and can be accessed via [https://idm-yourstackid.splunkcloud.com]. If you do not have an IDM you can reach out to your local / assigned Splunk Account Rep who can assist with adding one to your Splunk Cloud instance.
Information on IDM's can be found here:
https://docs.splunk.com/Documentation/SplunkCloud/7.2.6/User/WelcometoSplunkCloud#Features_of_Splunk_Cloud
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