The Catalog tool is a built-in feature of Autonomous Database that provides an easily searchable inventory of all the objects in, or accessible from, the database, such as schemas, tables, views, columns, analytic views, files on cloud object storage, and more1. However, the Catalog tool does not allow you to delete any entity from the database.You can only view the details, lineage, and impact of an entity using the Catalog tool2.To delete an entity from the database, you need to use other tools such as SQL Developer Web or APEX3.
Manage Automatic Indexing on Autonomous Database - Oracle Help Center.
Introducing the Autonomous Database Catalog - Oracle Blogs.
Oracle Autonomous Database - Oracle Autonomous Database.

The default data and temporary tablespaces for the database are configured automatically. Adding, removing, or modifying tablespaces is not allowed.
Oracle Data Pump offers very fast bulk data and metadata movement between Oracle databases and Autonomous Database .
Data Pump Import lets you import data from Data Pump files residing on Oracle Cloud Infrastructure Object Storage, Microsoft Azure, AWS S3, and Oracle Cloud Infrastructure Object Storage Classic. You can save your data to your Cloud Object Store and use Oracle Data Pump to load data to
https://docs.oracle.com/en/cloud/paas/atp-cloud/atpug/load-data-data-pump.html#GUID-297FE3E6-A823-4F98-AD50-959ED96E6969

When using Data Pump to migrate your Oracle database to Autonomous Database, you can import data and schemas from Data Pump files. You cannot import tablespaces or reports. SeeExport Your Existing Oracle Database to Import into Autonomous Databasefor more details.