• Assume that your AWS credential is set up in the local computer, its profile is default, and the region is ap-northeast-1. If they are different, change them accordingly.
• At the beginning of your R file, read the credential information by

# set aws s3
signature <-
  aws.signature::locate_credentials(
    profile = "default",
    region = "ap-northeast-1"
  )
Sys.setenv(
  "AWS_ACCESS_KEY_ID" = signature$key,
  "AWS_SECRET_ACCESS_KEY" = signature$secret,
  "AWS_DEFAULT_REGION" = signature$region
)

• Specify the bucket name as

bucket_name <- "mobileapp-rstudio"

• Then, you can directly read data from the bucket as

equilibrium <-
  aws.s3::s3readRDS(
    object = "output/simulate/equilibrium.rds",
    bucket = bucket_name,
    multipart = TRUE
  )

• You can also save data as

aws.s3::s3saveRDS(
  equilibrium,
  object = 
    paste0(
      prefix, 
      "equilibrium.rds"
    ),
  bucket = bucket_name,
  multipart = TRUE
)

• To read and write other formats of data, check the help of aws.s3. There are functions like s3read_using.